A wall of drifting panels that react to viewers' presence. The shapes on each panel slowly drift upwards, changing their look and behavior as they cross the membrane between panels. When a viewer stands in front of a particular column, the shapes on that column slow their movement and begin to slide down, rather than up, the wall. When the viewer walks away, the shapes revert to their upward drift.
The columns begin identically and change in reaction to viewers, so the state of the piece at any given time is the result of every viewer who stood in front of the piece since it began.
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