points:
  rotate: 22.5
  zones:
    matrix:
      rotate: 22.5
      key:
        origin: [-u/2, -u/2]
      columns:
        left:
        right.key:
          rotate: -45
          padding: (1+sqrt(2))/2 * u
          spread: (1+sqrt(2))/2 * u
      rows:
        bottom:
        top: