minecraft-datapacks/resourcepack/assets/minecraft/models/block/observer.json

{
    "parent": "block/block",
    "textures": {
        "bottom": "block/observer_back",
        "side": "block/observer_side",
        "top": "block/observer_top",
        "front": "block/observer_front",
        "particle": "block/observer_front"
    },
    "elements": [
        {
            "from": [
                0,
                0,
                0
            ],
            "to": [
                16,
                16,
                16
            ],
            "faces": {
                "down": {
                    "uv": [
                        0,
                        0,
                        16,
                        16
                    ],
                    "texture": "#top",
                    "cullface": "down"
                },
                "up": {
                    "uv": [
                        0,
                        16,
                        16,
                        0
                    ],
                    "texture": "#top",
                    "cullface": "up"
                },
                "north": {
                    "uv": [
                        0,
                        0,
                        16,
                        16
                    ],
                    "texture": "#front",
                    "cullface": "north"
                },
                "south": {
                    "uv": [
                        0,
                        0,
                        16,
                        16
                    ],
                    "texture": "#bottom",
                    "cullface": "south"
                },
                "west": {
                    "uv": [
                        16,
                        16,
                        0,
                        0
                    ],
                    "texture": "#side",
                    "cullface": "west"
                },
                "east": {
                    "uv": [
                        0,
                        16,
                        16,
                        0
                    ],
                    "texture": "#side",
                    "cullface": "east"
                }
            }
        }
    ]
}