 loop: true; dir: alternate">
              <a-sphere radius="3" color="#4CC3D9"></a-sphere>
              <a-cylinder position="0 5 0" height="10" radius="0.075" color="#404040"></a-cylinder>

              <a-entity position="0 10 0" animation="property: rotation; to: 50 40 50; dur: 2000; delay: 250; loop: true; dir: alternate">
                <a-sphere radius="4.5" color="#FFC65D"></a-sphere>
                <a-cylinder position="0 5 0" height="10" radius="0.075" color="#404040"></a-cylinder>

         