diff --git a/asm/object/doubleBookshelf.s b/asm/object/doubleBookshelf.s
deleted file mode 100644
index 1fdaa0d4..00000000
--- a/asm/object/doubleBookshelf.s
+++ /dev/null
@@ -1,560 +0,0 @@
-	.include "asm/macros.inc"
-
-	.include "constants/constants.inc"
-
-	.syntax unified
-
-	.text
-
-
-	thumb_func_start DoubleBookshelf
-DoubleBookshelf: @ 0x0809AF5C
-	push {lr}
-	ldr r2, _0809AF70 @ =gUnk_08123D58
-	ldrb r1, [r0, #0xc]
-	lsls r1, r1, #2
-	adds r1, r1, r2
-	ldr r1, [r1]
-	bl _call_via_r1
-	pop {pc}
-	.align 2, 0
-_0809AF70: .4byte gUnk_08123D58
-
-	thumb_func_start sub_0809AF74
-sub_0809AF74: @ 0x0809AF74
-	push {r4, r5, r6, lr}
-	adds r4, r0, #0
-	ldrb r0, [r4, #0xa]
-	strb r0, [r4, #0x1e]
-	movs r0, #0x2e
-	ldrsh r2, [r4, r0]
-	ldr r1, _0809AFBC @ =gRoomControls
-	ldrh r0, [r1, #6]
-	subs r2, r2, r0
-	asrs r2, r2, #4
-	movs r3, #0x3f
-	ands r2, r3
-	movs r5, #0x32
-	ldrsh r0, [r4, r5]
-	ldrh r1, [r1, #8]
-	subs r0, r0, r1
-	asrs r0, r0, #4
-	ands r0, r3
-	lsls r0, r0, #6
-	orrs r2, r0
-	adds r0, r4, #0
-	adds r0, #0x80
-	movs r6, #0
-	strh r2, [r0]
-	ldrb r0, [r4, #0xa]
-	cmp r0, #0
-	beq _0809AFC4
-	movs r1, #1
-	strb r1, [r4, #0xc]
-	adds r0, r4, #0
-	adds r0, #0x84
-	ldrb r0, [r0]
-	cmp r0, #0
-	bne _0809AFC0
-	strb r6, [r4, #0xd]
-	b _0809B02C
-	.align 2, 0
-_0809AFBC: .4byte gRoomControls
-_0809AFC0:
-	strb r1, [r4, #0xd]
-	b _0809B02C
-_0809AFC4:
-	movs r0, #3
-	strb r0, [r4, #0xc]
-	movs r0, #4
-	strb r0, [r4, #0xd]
-	adds r0, r4, #0
-	adds r0, #0x84
-	strb r6, [r0]
-	adds r0, r4, #0
-	bl UpdateSpriteForCollisionLayer
-	movs r0, #0x8b
-	movs r1, #1
-	movs r2, #0
-	bl CreateObject
-	adds r5, r0, #0
-	cmp r5, #0
-	beq _0809B026
-	str r4, [r5, #0x50]
-	str r5, [r4, #0x54]
-	adds r0, r4, #0
-	adds r0, #0x86
-	ldrh r0, [r0]
-	bl CheckFlags
-	cmp r0, #0
-	bne _0809B010
-	movs r3, #0x80
-	lsls r3, r3, #0xd
-	adds r0, r4, #0
-	adds r1, r5, #0
-	adds r2, r3, #0
-	bl PositionRelative
-	adds r0, r5, #0
-	adds r0, #0x84
-	strb r6, [r0]
-	b _0809B026
-_0809B010:
-	movs r3, #0x80
-	lsls r3, r3, #0xd
-	adds r0, r4, #0
-	adds r1, r5, #0
-	movs r2, #0
-	bl PositionRelative
-	adds r1, r5, #0
-	adds r1, #0x84
-	movs r0, #1
-	strb r0, [r1]
-_0809B026:
-	adds r0, r4, #0
-	bl sub_0809B334
-_0809B02C:
-	adds r0, r4, #0
-	bl sub_0809B0B0
-	pop {r4, r5, r6, pc}
-
-	thumb_func_start sub_0809B034
-sub_0809B034: @ 0x0809B034
-	push {r4, lr}
-	adds r4, r0, #0
-	adds r0, #0x82
-	ldrh r0, [r0]
-	adds r1, r4, #0
-	adds r1, #0x38
-	ldrb r1, [r1]
-	bl GetTileType
-	adds r0, r4, #0
-	bl sub_0809B234
-	pop {r4, pc}
-	.align 2, 0
-
-	thumb_func_start sub_0809B050
-sub_0809B050: @ 0x0809B050
-	push {r4, r5, lr}
-	adds r4, r0, #0
-	bl LinearMoveUpdate
-	ldrb r0, [r4, #0xe]
-	subs r0, #1
-	strb r0, [r4, #0xe]
-	lsls r0, r0, #0x18
-	cmp r0, #0
-	bne _0809B0A2
-	movs r0, #1
-	strb r0, [r4, #0xc]
-	movs r0, #0x2e
-	ldrsh r1, [r4, r0]
-	ldr r2, _0809B0A4 @ =gRoomControls
-	ldrh r0, [r2, #6]
-	subs r1, r1, r0
-	asrs r1, r1, #4
-	movs r3, #0x3f
-	ands r1, r3
-	movs r5, #0x32
-	ldrsh r0, [r4, r5]
-	ldrh r2, [r2, #8]
-	subs r0, r0, r2
-	asrs r0, r0, #4
-	ands r0, r3
-	lsls r0, r0, #6
-	orrs r1, r0
-	adds r0, r4, #0
-	adds r0, #0x80
-	strh r1, [r0]
-	movs r0, #0
-	bl SetPlayerControl
-	adds r0, r4, #0
-	bl sub_0809B0B0
-	movs r0, #0x86
-	lsls r0, r0, #1
-	bl EnqueueSFX
-_0809B0A2:
-	pop {r4, r5, pc}
-	.align 2, 0
-_0809B0A4: .4byte gRoomControls
-
-	thumb_func_start sub_0809B0A8
-sub_0809B0A8: @ 0x0809B0A8
-	push {lr}
-	bl sub_0809B234
-	pop {pc}
-
-	thumb_func_start sub_0809B0B0
-sub_0809B0B0: @ 0x0809B0B0
-	push {r4, r5, r6, r7, lr}
-	mov r7, r8
-	push {r7}
-	mov r8, r0
-	adds r0, #0x80
-	ldrh r0, [r0]
-	subs r6, r0, #1
-	mov r0, r8
-	adds r0, #0x38
-	ldrb r7, [r0]
-	mov r1, r8
-	ldrb r0, [r1, #0xd]
-	cmp r0, #4
-	bls _0809B0CE
-	b _0809B228
-_0809B0CE:
-	lsls r0, r0, #2
-	ldr r1, _0809B0D8 @ =_0809B0DC
-	adds r0, r0, r1
-	ldr r0, [r0]
-	mov pc, r0
-	.align 2, 0
-_0809B0D8: .4byte _0809B0DC
-_0809B0DC: @ jump table
-	.4byte _0809B0F0 @ case 0
-	.4byte _0809B130 @ case 1
-	.4byte _0809B178 @ case 2
-	.4byte _0809B1C0 @ case 3
-	.4byte _0809B208 @ case 4
-_0809B0F0:
-	mov r1, r8
-	adds r1, #0x84
-	movs r0, #0
-	strb r0, [r1]
-	adds r5, r6, #2
-	mov r0, r8
-	adds r0, #0x82
-	strh r5, [r0]
-	ldr r0, _0809B128 @ =0x00004082
-	subs r1, r6, #1
-	adds r2, r7, #0
-	bl SetTile
-	ldr r4, _0809B12C @ =0x00004022
-	adds r0, r4, #0
-	adds r1, r6, #0
-	adds r2, r7, #0
-	bl SetTile
-	adds r1, r6, #1
-	adds r0, r4, #0
-	adds r2, r7, #0
-	bl SetTile
-	adds r0, r4, #0
-	adds r1, r5, #0
-	b _0809B162
-	.align 2, 0
-_0809B128: .4byte 0x00004082
-_0809B12C: .4byte 0x00004022
-_0809B130:
-	mov r1, r8
-	adds r1, #0x84
-	movs r0, #1
-	strb r0, [r1]
-	mov r0, r8
-	adds r0, #0x82
-	strh r6, [r0]
-	ldr r0, _0809B16C @ =0x0000405F
-	adds r1, r6, #0
-	adds r2, r7, #0
-	bl SetTile
-	ldr r4, _0809B170 @ =0x00004022
-	adds r1, r6, #1
-	adds r0, r4, #0
-	adds r2, r7, #0
-	bl SetTile
-	adds r1, r6, #2
-	adds r0, r4, #0
-	adds r2, r7, #0
-	bl SetTile
-	ldr r0, _0809B174 @ =0x00004082
-	adds r1, r6, #3
-_0809B162:
-	adds r2, r7, #0
-	bl SetTile
-	b _0809B228
-	.align 2, 0
-_0809B16C: .4byte 0x0000405F
-_0809B170: .4byte 0x00004022
-_0809B174: .4byte 0x00004082
-_0809B178:
-	mov r1, r8
-	adds r1, #0x84
-	movs r0, #1
-	strb r0, [r1]
-	mov r0, r8
-	adds r0, #0x82
-	strh r6, [r0]
-	ldr r0, _0809B1B4 @ =0x00004082
-	adds r1, r6, #3
-	adds r2, r7, #0
-	bl SetTile
-	ldr r0, _0809B1B8 @ =0x00004022
-	adds r1, r6, #2
-	adds r2, r7, #0
-	bl SetTile
-	ldr r0, _0809B1BC @ =0x0000405F
-	adds r1, r6, #0
-	adds r2, r7, #0
-	bl SetTile
-	mov r1, r8
-	ldr r0, [r1, #0x50]
-	adds r0, #0x86
-	ldrh r0, [r0]
-	bl SetFlag
-	b _0809B228
-	.align 2, 0
-_0809B1B4: .4byte 0x00004082
-_0809B1B8: .4byte 0x00004022
-_0809B1BC: .4byte 0x0000405F
-_0809B1C0:
-	mov r1, r8
-	adds r1, #0x84
-	movs r0, #0
-	strb r0, [r1]
-	adds r4, r6, #2
-	mov r0, r8
-	adds r0, #0x82
-	strh r4, [r0]
-	ldr r0, _0809B1FC @ =0x00004082
-	subs r1, r6, #1
-	adds r2, r7, #0
-	bl SetTile
-	ldr r0, _0809B200 @ =0x00004022
-	adds r1, r6, #0
-	adds r2, r7, #0
-	bl SetTile
-	ldr r0, _0809B204 @ =0x0000405F
-	adds r1, r4, #0
-	adds r2, r7, #0
-	bl SetTile
-	mov r1, r8
-	ldr r0, [r1, #0x50]
-	adds r0, #0x86
-	ldrh r0, [r0]
-	bl ClearFlag
-	b _0809B228
-	.align 2, 0
-_0809B1FC: .4byte 0x00004082
-_0809B200: .4byte 0x00004022
-_0809B204: .4byte 0x0000405F
-_0809B208:
-	ldr r4, _0809B230 @ =0x00004022
-	adds r0, r4, #0
-	adds r1, r6, #0
-	adds r2, r7, #0
-	bl SetTile
-	adds r1, r6, #1
-	adds r0, r4, #0
-	adds r2, r7, #0
-	bl SetTile
-	adds r1, r6, #2
-	adds r0, r4, #0
-	adds r2, r7, #0
-	bl SetTile
-_0809B228:
-	pop {r3}
-	mov r8, r3
-	pop {r4, r5, r6, r7, pc}
-	.align 2, 0
-_0809B230: .4byte 0x00004022
-
-	thumb_func_start sub_0809B234
-sub_0809B234: @ 0x0809B234
-	push {r4, lr}
-	adds r4, r0, #0
-	ldrb r0, [r4, #0xa]
-	cmp r0, #0
-	beq _0809B26A
-	ldr r2, [r4, #0x50]
-	ldrb r1, [r2, #0x19]
-	lsrs r1, r1, #6
-	lsls r1, r1, #6
-	ldrb r3, [r4, #0x19]
-	movs r0, #0x3f
-	ands r0, r3
-	orrs r0, r1
-	strb r0, [r4, #0x19]
-	adds r2, #0x29
-	ldrb r1, [r2]
-	lsls r1, r1, #0x1d
-	adds r3, r4, #0
-	adds r3, #0x29
-	lsrs r1, r1, #0x1d
-	ldrb r2, [r3]
-	movs r0, #8
-	rsbs r0, r0, #0
-	ands r0, r2
-	orrs r0, r1
-	strb r0, [r3]
-	b _0809B270
-_0809B26A:
-	adds r0, r4, #0
-	bl sub_0809B274
-_0809B270:
-	pop {r4, pc}
-	.align 2, 0
-
-	thumb_func_start sub_0809B274
-sub_0809B274: @ 0x0809B274
-	push {r4, r5, lr}
-	adds r4, r0, #0
-	ldr r3, _0809B290 @ =gPlayerEntity
-	adds r2, r4, #0
-	adds r2, #0x84
-	ldrb r0, [r2]
-	cmp r0, #1
-	beq _0809B2BA
-	cmp r0, #1
-	bgt _0809B294
-	cmp r0, #0
-	beq _0809B29A
-	b _0809B332
-	.align 2, 0
-_0809B290: .4byte gPlayerEntity
-_0809B294:
-	cmp r0, #2
-	beq _0809B30C
-	b _0809B332
-_0809B29A:
-	movs r1, #0x32
-	ldrsh r0, [r3, r1]
-	adds r0, #0x14
-	movs r3, #0x32
-	ldrsh r1, [r4, r3]
-	cmp r0, r1
-	bge _0809B332
-	movs r0, #1
-	strb r0, [r2]
-	adds r2, r4, #0
-	adds r2, #0x29
-	ldrb r1, [r2]
-	subs r0, #9
-	ands r0, r1
-	movs r1, #5
-	b _0809B306
-_0809B2BA:
-	movs r5, #0x2e
-	ldrsh r0, [r3, r5]
-	adds r0, #0x1c
-	movs r5, #0x2e
-	ldrsh r1, [r4, r5]
-	cmp r0, r1
-	ble _0809B2E8
-	movs r0, #2
-	strb r0, [r2]
-	ldr r0, _0809B2E4 @ =0x00004022
-	adds r1, r4, #0
-	adds r1, #0x80
-	ldrh r1, [r1]
-	adds r1, #2
-	movs r2, #1
-	bl SetTile
-	ldr r0, [r4, #0x54]
-	bl sub_0809B358
-	b _0809B332
-	.align 2, 0
-_0809B2E4: .4byte 0x00004022
-_0809B2E8:
-	movs r1, #0x32
-	ldrsh r0, [r3, r1]
-	adds r0, #0x10
-	movs r3, #0x32
-	ldrsh r1, [r4, r3]
-	cmp r0, r1
-	ble _0809B332
-	movs r0, #0
-	strb r0, [r2]
-	adds r2, r4, #0
-	adds r2, #0x29
-	ldrb r1, [r2]
-	subs r0, #8
-	ands r0, r1
-	movs r1, #4
-_0809B306:
-	orrs r0, r1
-	strb r0, [r2]
-	b _0809B332
-_0809B30C:
-	movs r5, #0x2e
-	ldrsh r0, [r3, r5]
-	adds r0, #0x20
-	movs r3, #0x2e
-	ldrsh r1, [r4, r3]
-	cmp r0, r1
-	bge _0809B332
-	movs r0, #1
-	strb r0, [r2]
-	adds r0, r4, #0
-	adds r0, #0x80
-	ldrh r0, [r0]
-	adds r0, #2
-	movs r1, #1
-	bl sub_0807BA8C
-	ldr r0, [r4, #0x54]
-	bl sub_0809B38C
-_0809B332:
-	pop {r4, r5, pc}
-
-	thumb_func_start sub_0809B334
-sub_0809B334: @ 0x0809B334
-	push {r4, r5, lr}
-	adds r0, #0x80
-	ldrh r0, [r0]
-	adds r4, r0, #0
-	subs r4, #0x81
-	movs r5, #2
-_0809B340:
-	ldr r0, _0809B354 @ =0x00004026
-	adds r1, r4, #0
-	movs r2, #1
-	bl SetTile
-	subs r5, #1
-	adds r4, #1
-	cmp r5, #0
-	bge _0809B340
-	pop {r4, r5, pc}
-	.align 2, 0
-_0809B354: .4byte 0x00004026
-
-	thumb_func_start sub_0809B358
-sub_0809B358: @ 0x0809B358
-	push {r4, r5, r6, lr}
-	adds r1, r0, #0
-	adds r1, #0x84
-	ldrb r1, [r1]
-	lsls r1, r1, #1
-	ldr r2, _0809B388 @ =gUnk_08123D68
-	adds r5, r1, r2
-	adds r0, #0x80
-	ldrh r0, [r0]
-	adds r4, r0, #0
-	subs r4, #0x82
-	movs r6, #4
-_0809B370:
-	ldrh r0, [r5]
-	adds r1, r4, #0
-	movs r2, #1
-	bl SetTile
-	subs r6, #1
-	adds r4, #1
-	adds r5, #4
-	cmp r6, #0
-	bge _0809B370
-	pop {r4, r5, r6, pc}
-	.align 2, 0
-_0809B388: .4byte gUnk_08123D68
-
-	thumb_func_start sub_0809B38C
-sub_0809B38C: @ 0x0809B38C
-	push {r4, r5, lr}
-	adds r0, #0x80
-	ldrh r0, [r0]
-	adds r4, r0, #0
-	subs r4, #0x82
-	movs r5, #4
-_0809B398:
-	adds r0, r4, #0
-	movs r1, #1
-	bl sub_0807BA8C
-	subs r5, #1
-	adds r4, #1
-	cmp r5, #0
-	bge _0809B398
-	pop {r4, r5, pc}
-	.align 2, 0
diff --git a/assets/assets.json b/assets/assets.json
index 5425bdd7..bbf20b82 100644
--- a/assets/assets.json
+++ b/assets/assets.json
@@ -45126,11 +45126,6 @@
     "start": 1195152,
     "size": 40
   },
-  {
-    "path": "doubleBookshelf/gUnk_08123D68.bin",
-    "start": 1195368,
-    "size": 20
-  },
   {
     "path": "object91/gUnk_08123DDC.bin",
     "start": 1195484,
diff --git a/data/const/object/doubleBookshelf.s b/data/const/object/doubleBookshelf.s
deleted file mode 100644
index 9bd699f0..00000000
--- a/data/const/object/doubleBookshelf.s
+++ /dev/null
@@ -1,14 +0,0 @@
-	.include "asm/macros.inc"
-	.include "constants/constants.inc"
-
-	.section .rodata
-    .align 2
-
-gUnk_08123D58:: @ 08123D58
-	.4byte sub_0809AF74
-	.4byte sub_0809B034
-	.4byte sub_0809B050
-	.4byte sub_0809B0A8
-
-gUnk_08123D68:: @ 08123D68
-	.incbin "doubleBookshelf/gUnk_08123D68.bin"
diff --git a/include/object.h b/include/object.h
index 4a4d11f4..b2342091 100644
--- a/include/object.h
+++ b/include/object.h
@@ -365,7 +365,7 @@ void OctorokBossObject(Entity*);
 void MacroBook(Entity*);
 void MazaalBossObject(Entity*);
 void CabinFurniture(Entity*);
-void DoubleBookshelf(Entity*);
+void DoubleBookshelf();
 void Book(Entity*);
 void Fireplace(Entity*);
 void Object8E();
diff --git a/linker.ld b/linker.ld
index 3569ac23..505a858a 100644
--- a/linker.ld
+++ b/linker.ld
@@ -784,7 +784,7 @@ SECTIONS {
         asm/object/macroBook.o(.text);
         asm/object/mazaalBossObject.o(.text);
         asm/object/cabinFurniture.o(.text);
-        asm/object/doubleBookshelf.o(.text);
+        src/object/doubleBookshelf.o(.text);
         src/object/book.o(.text);
         src/object/fireplace.o(.text);
         src/object/object8E.o(.text);
@@ -1539,7 +1539,7 @@ SECTIONS {
         data/animations/object/macroBook.o(.rodata);
         data/const/object/mazaalBossObject.o(.rodata);
         data/const/object/cabinFurniture.o(.rodata);
-        data/const/object/doubleBookshelf.o(.rodata);
+        src/object/doubleBookshelf.o(.rodata);
         src/object/book.o(.rodata);
         data/const/object/fireplace.o(.rodata);
         src/object/object8E.o(.rodata);
diff --git a/src/object/doubleBookshelf.c b/src/object/doubleBookshelf.c
new file mode 100644
index 00000000..f7093e7e
--- /dev/null
+++ b/src/object/doubleBookshelf.c
@@ -0,0 +1,215 @@
+/**
+ * @file doubleBookshelf.c
+ * @ingroup Objects
+ *
+ * @brief Double Bookshelf object
+ */
+
+#define NENT_DEPRECATED
+#include "global.h"
+#include "object.h"
+#include "functions.h"
+
+typedef struct {
+    /*0x00*/ Entity base;
+    /*0x68*/ u8 unk_68[0x18];
+    /*0x80*/ u16 unk_80;
+    /*0x82*/ u16 unk_82;
+    /*0x84*/ u8 unk_84;
+    /*0x85*/ u8 unk_85;
+    /*0x86*/ u16 unk_86;
+} DoubleBookshelfEntity;
+
+void sub_0809B334(DoubleBookshelfEntity*);
+void sub_0809B0B0(DoubleBookshelfEntity*);
+void sub_0809B234(DoubleBookshelfEntity*);
+void sub_0809B274(DoubleBookshelfEntity*);
+void sub_0809B358(DoubleBookshelfEntity*);
+void sub_0809B38C(DoubleBookshelfEntity*);
+void DoubleBookshelf_Init(DoubleBookshelfEntity*);
+void DoubleBookshelf_Action1(DoubleBookshelfEntity*);
+void DoubleBookshelf_Action2(DoubleBookshelfEntity*);
+void DoubleBookshelf_Action3(DoubleBookshelfEntity*);
+
+void DoubleBookshelf(DoubleBookshelfEntity* this) {
+    static void (*const DoubleBookshelf_Actions[])(DoubleBookshelfEntity*) = {
+        DoubleBookshelf_Init,
+        DoubleBookshelf_Action1,
+        DoubleBookshelf_Action2,
+        DoubleBookshelf_Action3,
+    };
+    DoubleBookshelf_Actions[super->action](this);
+}
+
+void DoubleBookshelf_Init(DoubleBookshelfEntity* this) {
+    DoubleBookshelfEntity* child;
+    super->frameIndex = super->type;
+    this->unk_80 = COORD_TO_TILE(super);
+    if (super->type != 0) {
+        super->action = 1;
+        if (this->unk_84 == 0) {
+            super->subAction = 0;
+        } else {
+            super->subAction = 1;
+        }
+    } else {
+        super->action = 3;
+        super->subAction = 4;
+        this->unk_84 = 0;
+        UpdateSpriteForCollisionLayer(super);
+        child = (DoubleBookshelfEntity*)CreateObject(DOUBLE_BOOKSHELF, 1, 0);
+        if (child != NULL) {
+            (child->base).parent = super;
+            super->child = &child->base;
+            if (CheckFlags(this->unk_86) == 0) {
+                PositionRelative(super, &child->base, 0x100000, 0x100000);
+                child->unk_84 = 0;
+            } else {
+                PositionRelative(super, &child->base, 0, 0x100000);
+                child->unk_84 = 1;
+            }
+        }
+        sub_0809B334(this);
+    }
+    sub_0809B0B0(this);
+}
+
+void DoubleBookshelf_Action1(DoubleBookshelfEntity* this) {
+    GetTileType(this->unk_82, super->collisionLayer);
+    sub_0809B234(this);
+}
+
+void DoubleBookshelf_Action2(DoubleBookshelfEntity* this) {
+    LinearMoveUpdate(super);
+    if (--super->actionDelay == 0) {
+        super->action = 1;
+        this->unk_80 = COORD_TO_TILE(super);
+        SetPlayerControl(CONTROL_ENABLED);
+        sub_0809B0B0(this);
+        EnqueueSFX(SFX_BUTTON_PRESS);
+    }
+}
+
+void DoubleBookshelf_Action3(DoubleBookshelfEntity* this) {
+    sub_0809B234(this);
+}
+
+void sub_0809B0B0(DoubleBookshelfEntity* this) {
+    u32 position = this->unk_80 - 1;
+    u32 layer = super->collisionLayer;
+    switch (super->subAction) {
+        case 0:
+            this->unk_84 = 0;
+            this->unk_82 = position + 2;
+            SetTile(0x4082, position - 1, layer);
+            SetTile(0x4022, position, layer);
+            SetTile(0x4022, position + 1, layer);
+            SetTile(0x4022, position + 2, layer);
+            break;
+        case 1:
+            this->unk_84 = 1;
+            this->unk_82 = position;
+            SetTile(0x405f, position, layer);
+            SetTile(0x4022, position + 1, layer);
+            SetTile(0x4022, position + 2, layer);
+            SetTile(0x4082, position + 3, layer);
+            break;
+        case 2:
+            this->unk_84 = 1;
+            this->unk_82 = position;
+            SetTile(0x4082, position + 3, layer);
+            SetTile(0x4022, position + 2, layer);
+            SetTile(0x405f, position, layer);
+            SetFlag(((DoubleBookshelfEntity*)super->parent)->unk_86);
+            break;
+        case 3:
+            this->unk_84 = 0;
+            this->unk_82 = position + 2;
+            SetTile(0x4082, position - 1, layer);
+            SetTile(0x4022, position, layer);
+            SetTile(0x405f, position + 2, layer);
+            ClearFlag(((DoubleBookshelfEntity*)super->parent)->unk_86);
+            break;
+        case 4:
+            SetTile(0x4022, position, layer);
+            SetTile(0x4022, position + 1, layer);
+            SetTile(0x4022, position + 2, layer);
+            break;
+    }
+}
+
+void sub_0809B234(DoubleBookshelfEntity* this) {
+    if (super->type != 0) {
+        super->spriteRendering.b3 = super->parent->spriteRendering.b3;
+        super->spritePriority.b0 = super->parent->spritePriority.b0;
+    } else {
+        sub_0809B274(this);
+    }
+}
+
+void sub_0809B274(DoubleBookshelfEntity* this) {
+    Entity* player = &gPlayerEntity;
+    switch (this->unk_84) {
+        case 0:
+            if (player->y.HALF.HI + 0x14 >= super->y.HALF.HI) {
+                return;
+            }
+            this->unk_84 = 1;
+            super->spritePriority.b0 = 5;
+            break;
+        case 1:
+            if (player->x.HALF.HI + 0x1c > super->x.HALF.HI) {
+                this->unk_84 = 2;
+                SetTile(0x4022, this->unk_80 + 2, 1);
+                sub_0809B358((DoubleBookshelfEntity*)super->child);
+                return;
+            }
+            if (player->y.HALF.HI + 0x10 <= super->y.HALF.HI) {
+                return;
+            }
+            this->unk_84 = 0;
+            super->spritePriority.b0 = 4;
+            break;
+        case 2:
+            if (player->x.HALF.HI + 0x20 >= super->x.HALF.HI) {
+                return;
+            }
+            this->unk_84 = 1;
+            sub_0807BA8C(this->unk_80 + 2, 1);
+            sub_0809B38C((DoubleBookshelfEntity*)super->child);
+            return;
+    }
+}
+
+void sub_0809B334(DoubleBookshelfEntity* this) {
+    s32 index;
+    u32 position = this->unk_80 - 0x81;
+    for (index = 2; index >= 0; index--, position++) {
+        SetTile(0x4026, position, 1);
+    }
+}
+
+void sub_0809B358(DoubleBookshelfEntity* this) {
+    static const u16 gUnk_08123D68[] = {
+        0x4022, 0x4022, 0x4074, 0x4026, 0x4074, 0x4074, 0x4026, 0x4074, 0x4022, 0x4022
+    };
+    s32 index;
+    const u16* array = &gUnk_08123D68[this->unk_84];
+    u32 position = this->unk_80 - 0x82;
+    for (index = 4; index >= 0;) {
+        SetTile(*array, position, 1);
+        index--;
+        position++;
+        array += 2;
+    }
+}
+
+void sub_0809B38C(DoubleBookshelfEntity* this) {
+    s32 index;
+    u32 uVar1 = this->unk_80 - 0x82;
+    for (index = 4; index >= 0;) {
+        sub_0807BA8C(uVar1, 1);
+        index--;
+        uVar1++;
+    }
+}