Louis Ducos du Hauron produced the first printed anaglyphs in 1891. Complementary color anaglyphs employ one of a pair of complementary color filters for each eye. The (ACB) process also enables black and white (monochromatic) anaglyphs with contrast balance. In sequence, he makes an anaglyphs in many central buildings in the city of Athens. Anaglyphs can be printed with normal printers and used as 3D posters.