Square Ring

   *     *******  *     *  *******        *     *     ******   
  * *    *        **   **  *              *    * *    *     *  
  * *    *        * * * *  *              *    * *    *     *  
 *   *   ****     *  *  *  ****           *   *   *   *     *  
 *****   *        *     *  *              *   *****   *     *  
*     *  *        *     *  *        *     *  *     *  *     *  
*     *  *******  *     *  *         *****   *     *  ******