The "pincushion grid" illusion

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Science  23 Apr 1976:
Vol. 192, Issue 4237, pp. 389-390
DOI: 10.1126/science.1257775


The illusion generated by a "pincushion grid" is not predicted from the two-dimensional Fourier transform of the grid. This implies that the visual system may not perform two-dimensional Fourier transforms of observed patterns.