Bubble Calendar / Calendar

The Bubble Calendar is made of silicone. First, adjust the red ring (means Sunday index) to the correct location every month. You can press down one silicone bubble that means the day passed. When all the bubbles are pressed down which means that the month is over, and then all the opposite side bubbles become convex, so you can turn over the Bubble Calendar. The new month started. By this way, the Bubble Calendar becomes a perpetual calendar.