Otto Heller with his stimulus series of apples
150 x 100 x 2.5 cm (h x w x d)

Otto Heller was intensively involved in frame of reference research and investigated it with various stimulus series. These included weights, cigarette of different length and also apples of different size.

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Narziß Ach (1871-1946)
150 x 100 x 2.5 cm (h x w x d)
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Karl Marbe (1869-1953)
150 x 98 x 2.5 cm (h x w x d)
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150 x 200 x 2.5 cm (h x w x d)
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Oswald Külpe at the double sound pendulum (~1900).
150 x 100 x 2.5 cm (h x w x d)
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