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| Cafe Wall
Above, the tiles are moving left and right in alternating rows. In the 'half-shifted condition', the 'mortar lines' (the horizontal lines between the tiles) appear to slope alternately upward and downward. This gives the impression that the tiles are wedge-shaped. As seen when the tiles align or make up a chequerboard, the lines are actually parallel, and all tiles are perfectly square and of the same size. So during the movement, the illusion comes and goes.
The Cafe Wall Illusion was first reported by Richard L. Gregory and Priscilla Heard in 1979. A member of Gregory's lab had noticed that the front of a cafe(St Michael's Hill, Bristol, England) had been adorned with black and white ceramic tiles. The mortar between adjacent rows of tiles was visually apparent, and the black/white pattern was offset by half a tile width in alternating rows.
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