Karl Marbe's color variator
15 x 50 x 15 cm (h x w x d)

Karl Marbe developed and built this color variator around 1893/94 during a research stay with Wilhelm Wundt in Leipzig.
It was the first apparatus of its kind that made it possible to change the proportions of the colors during rotation.

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150 x 100 x 2.5 cm (h x w x d)
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Otto Heller with his stimulus series of apples
150 x 100 x 2.5 cm (h x w x d)
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Lothar Schmidt-Atzert
150 x 100 x 2.5 cm (h x w x d)
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Gustav Lienert (1920-2001) and Wilhelm Janke (1935-2012)
150 x 100 x 2.5 cm (h x w x d)
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