<mujocoinclude>
    <body childclass="wall_base">
      <geom material="wall_brick" type="box" size="0.15 0.01 0.15" pos="0 0 0.15"/>
      <geom class="wall_col" type="box" size="0.15 0.01 0.15" pos="0 0 0.15" mass="1"/>
    </body>
</mujocoinclude>
