root:
  items:
    - image: xy-gradient(512, 512)
      bounds: 0 0 512 512
      stretch-size: 512 512
    - image: xy-gradient(512, 512)
      bounds: 512 0 512 512
      stretch-size: 512 512
    - image: xy-gradient(512, 512)
      bounds: 0 512 512 512
      stretch-size: 512 512
    - image: xy-gradient(512, 512)
      bounds: 512 512 512 512
      stretch-size: 512 512