Jastrow illusion
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The Jastrow illusion is an optical illusion attributed to the Polish-American psychologist Joseph Jastrow. This optical illusion is known under different names: Ring-Segment illusion, Jastrow illusion
Identical toy railway tracks as a real example of a Jastrow illusion
Wilhelm Wundt
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Wilhelm Maximilian Wundt was a German physiologist, philosopher, professor, and one of the fathers of modern psychology. Wundt, who distinguished psychology as a science from philosophy and biology, w
Jastrow illusion
…His version is different from the commonly used figure because the two arches taper to one end. On the other side of the Atlantic, German scientist Wilhelm Wundt was also pioneering in psychology research. He wrote one of the first books about geometric optical illusions in which he copied the design previously…
Wundt in 1902
Wilhelm Wundt (seated) with colleagues in his psychological laboratory, the first of its kind
Wundt's gravestone
(Wundt, Grundzüge, 1903, 5th ed. Vol. 1, p. 324.)