»Hourglass rise and fall«, 1996 by Reico Yamaguchi.
“Hourglass Mirror” by Daniel Rozin. The image of the viewer is created by the movement of the grains of sand in the upper part of the hourglass, in the lower part of the hourglass a representative color of the viewer is settled to create a sediment that keeps building up creating a history of a few minutes worth of viewers. Video.