xtends Group {
            constructor() {
                super();

                this.initMesh();
            }

            initMesh() {
                const material = new MeshStandardMaterial({ metalness: 1 });

                // Penrose triangle geometry
                const bottomBox = new BoxGeometry(50, 50, 300);
                const bottomMesh = new Mesh(bottomBox, material);
                this.add(bottomMesh);

                const upBox = new BoxGeometry(50, 250, 50);
                co