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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Konrad von Dieterich (1847-1888)
150 x 98 x 2.5 cm (h x w x d)
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Letter of Carl Stumpf on the 1st volume of his Tonpsychologie 1882
150 x 100 x 2.5 cm (h x w x d)
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Rector Stumpf about 1908
150 x 98 x 2.5 cm (h x w x d)
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Letter from R.H. Lotze to Carl Stumpf - December 1869
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