Stackable Ring

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