diff --git a/packages/frontend/assets/room/objects/aircon/aircon.blend b/packages/frontend/assets/room/objects/aircon/aircon.blend
index d334b0a392..a68ca19040 100644
Binary files a/packages/frontend/assets/room/objects/aircon/aircon.blend and b/packages/frontend/assets/room/objects/aircon/aircon.blend differ
diff --git a/packages/frontend/assets/room/objects/aircon/aircon.glb b/packages/frontend/assets/room/objects/aircon/aircon.glb
index 0ddf793a53..48a29d06e9 100644
Binary files a/packages/frontend/assets/room/objects/aircon/aircon.glb and b/packages/frontend/assets/room/objects/aircon/aircon.glb differ
diff --git a/packages/frontend/assets/room/objects/color-box/color-box.blend b/packages/frontend/assets/room/objects/color-box/color-box.blend
index f96a4ff766..19b4d3f453 100644
Binary files a/packages/frontend/assets/room/objects/color-box/color-box.blend and b/packages/frontend/assets/room/objects/color-box/color-box.blend differ
diff --git a/packages/frontend/assets/room/objects/color-box/color-box.glb b/packages/frontend/assets/room/objects/color-box/color-box.glb
index 43f2abcae8..32f221c96b 100644
Binary files a/packages/frontend/assets/room/objects/color-box/color-box.glb and b/packages/frontend/assets/room/objects/color-box/color-box.glb differ
diff --git a/packages/frontend/src/pages/room.vue b/packages/frontend/src/pages/room.vue
index 5c093243cd..c5541e5c7f 100644
--- a/packages/frontend/src/pages/room.vue
+++ b/packages/frontend/src/pages/room.vue
@@ -128,6 +128,11 @@ onMounted(() => {
 			type: 'tv',
 			position: [-115, 0, -85],
 			rotation: [0, 0, 0],
+		}, {
+			id: 'q',
+			type: 'color-box',
+			position: [-135, 0, -5],
+			rotation: [0, 0, 0],
 		}],
 	}, {
 		canvas: canvas.value!,
diff --git a/packages/frontend/src/utility/room/engine.ts b/packages/frontend/src/utility/room/engine.ts
index e05b495fee..28c3291063 100644
--- a/packages/frontend/src/utility/room/engine.ts
+++ b/packages/frontend/src/utility/room/engine.ts
@@ -8,6 +8,7 @@
  * - 単位はセンチメートルで設計すること。
  * - それを置いたときに底になる縦軸座標(blenderならz)が0になるように設計すること。
  * - メッシュ名を _COLLISION_TOP_ で始めると、その面の上にモノを置けることを示せます。当該メッシュはレンダリングでは表示されません。
+ * - なお、現状 _COLLISION_TOP_ メッシュは単一の面でなければなりません。つまりArray Modifierなどを適用した状態では正しく動作しません。
  */
 
 import * as BABYLON from '@babylonjs/core';
@@ -681,7 +682,6 @@ export class RoomEngine {
 		roomObj.meshes[0].scaling = new BABYLON.Vector3(-100, 100, 100);
 		roomObj.meshes[0].bakeCurrentTransformIntoVertices();
 		for (const mesh of roomObj.meshes) {
-			console.log(mesh.name);
 			//if (mesh.name === '__root__') continue;
 			if (mesh.name.startsWith('_COLLISION_')) {
 				mesh.receiveShadows = false;