private static async UniTask <Cube> CreateBox(WorldLayer layer)
{
var timing = layer.GetValidScreen().TimingPoints.Update;
var cube = new Cube();
cube.Position = new(-3, 0.5f, 0);
cube.Shader = new PhongShader();
cube.AddComponent(await Resources.Sandbox["box.png"].LoadTextureAsync(timing));
await cube.Activate(layer);
cube.StartCoroutine(static async(coroutine, cube) =>
