transform {
  /* adding the perspective line here turns the matrix from a 2D
     category into a 3D category. It does not have any visual effect. */
  transform: perspective(200) scale(2);
  child: container {
    color {
      bounds: 0 0 50 50;
      color: transparent;
    }

    clip {
      clip: 10 10 30 30;
      child: color {
        bounds: 0 0 50 50;
        color: red;
      }
    }
  }
}