 </a-entity>

      <!-- Cylinders. -->
      <a-entity position="-2.5 0 -5">
        <a-entity mixin="column">
          <a-entity mixin="column-light"></a-entity>
          <a-entity mixin="object-on-column color cylinder spinX"></a-entity>
        </a-entity>
        <a-entity mixin="column-bottom"></a-entity>
      </a-entity>

      <!-- Rings. -->
      <a-entity position="2.5 0 1">
        <a-entity mixin="column">
          <a-entity mixin="column-light"></a-entity>
          <a-entity mixin="object