Create/Update assets for version 1.21

assets/minecraft/models/block/bell_ceiling.json

@@ -0,0 +1,19 @@
+{
+    "textures": {
+        "particle": "block/bell_bottom",
+        "bar": "block/dark_oak_planks"
+    },
+    "elements": [
+        {
+            "from": [ 7, 13, 7 ],
+            "to": [ 9, 16, 9 ],
+            "faces": {
+                "north": {"uv": [ 7, 2, 9, 5 ], "texture": "#bar" },
+                "east":  {"uv": [ 1, 2, 3, 5 ], "texture": "#bar" },
+                "south": {"uv": [ 6, 2, 8, 5 ], "texture": "#bar" },
+                "west":  {"uv": [ 4, 2, 6, 5 ], "texture": "#bar" },
+                "up":    {"uv": [ 1, 3, 3, 5 ], "texture": "#bar", "cullface": "up" }
+            }
+        }
+    ]
+}