    // This example is pulled from the Plink demo.
    if(ChipmunkDemoRightDown){
      // Find the shape under the mouse.
      cpShape *nearest = cpSpaceNearestPointQueryNearest(space, ChipmunkDemoMouse, 0.0, GRABABLE_MASK_BIT, CP_NO_GROUP, NULL);
      if(nearest){
        cpBody *body = cpShapeGetBody(nearest);
        if(cpBodyIsStatic(body)){
          // If the body is static, convert it to dynamic and add it to the space.
          cpSpaceConvertBodyToDynamic(space, body, pentagon_mass, pentagon_moment);
          cpSpaceAddBody(space, body);
        } else {
          // If the body is dynamic, remove it from the space and convert it to static.
          cpSpaceRemoveBody(space, body);
          cpSpaceConvertBodyToStatic(space, body);
        }
      }
    }