Kinetic Sandscapes by KB

Sandscape art from Klaus Bösch available here:

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Follow this link to learn more about Mr. Bösch's art (since 1988)

Kinetic Sandscape: by Klaus Bösch, aka “The Sandman”, the originator of the sand+water+bubble form of these kinetic art pieces. The phenomenon of spontaneous stratification is a striking feature of these Sandpictures. Typically pouring stuff together results in further mixing, yet here, when the sand mixture descends through a gap in the air bubbles, the resulting pile is ordered into sorted layers. The larger rounded dark grains separate from the smaller sharp-edged white grains forming the layers you see here. The darker grains alone would stack into a steeper pile (larger angle of repose) than the white which would form a less steep pile. The stratification process is a slow one in this device, here each transformation takes about 40 minutes or more- shown here using iPhone time lapse. 

Kinetic Sandscape

This version is very well made and shows the phenomena of spontaneous stratification better than most versions I've seen: 
From Amazon: BUY NOW  Kinetic Sandscape 

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Kinetic Sandscape: the phenomenon of spontaneous stratification is a striking feature of this sand motion desk toy. Typically pouring stuff together results in further mixing, yet here, when the sand mixture descends through a gap in the air bubbles, the resulting pile is ordered into sorted layers. The larger rounded dark grains separate from the smaller sharp-edged white grains forming the layers you see here. The darker grains alone would stack into a steeper pile (larger angle of repose) than the white which would form a less steep pile. The stratification process is a slow one in this device, here about 30 minutes have been condensed to the 60 second IG format.