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This work consists of two parts: in the first, a spotlight projects an orange square of light onto a wall. After about ten seconds it is turned off, and viewers perceive a blue afterimage, blue being the complementary colour to orange. In the second part, a spotlight projects a blue square of light onto a wall of a seperate space. This time the afterimage is orange.

Details
Materials
Spotlight, dimmer, tripod, colour filter foil