Gabor Baranyai designed a cool clock that unlike the traditional time pieces doesn’t tells you the time in a cool way. There are different chambers in the ORA wall mount Rotary Sand Clock that needs to be filled to work. When a chamber is filled up the clock turns 30 degrees counterclockwise. As y’all can see there are small valves between the chambers.Each of them is controlled mechanically by the cam rods hidden in the tubular spokes. Chambers indicate minutes. The clock appears to stay stationery with the sand running around chamber to chamber. Past 9 the sand seems to flow upwards. I like the cool concept of the clock!