<mujocoinclude>
    <body childclass="block_base">
      <geom material="block_red" pos="0 0 .02" size="0.02 0.02" type="cylinder"/>
      <geom class="block_col" pos="0 0 .02" size="0.02 0.02" type="cylinder" mass=".01"/>
    </body>
</mujocoinclude>
