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        <a-mixin id="layer-7--dark" material="color: rgb(142,142,142)"></a-mixin>
        <a-mixin id="layer-8--dark" material="color: rgb(179,179,179)"></a-mixin>
        <a-mixin id="layer-9--dark" material="color: rgb(219,219,219)"></a-mixin>
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      <a-entity id="world" rotation="0 0 0" position="0 -3 0"></a-entity>

      <a-entity class="light--light" light="type: directional; color: #fff; intensity: 0.628"
                position=