Stackable Ring

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