A visual illusion in which columns of staggered hollow squares appear to be misaligned on the horizontal axis (see illustration). It is essentially a variant of the Münsterberg illusion without alternating colours. Also called the Taylor-Woodhouse illusion. [First published in 1980 by the English optometrists Stephen P(hilip) Taylor (born 1951) and J(oy) Margaret Woodhouse (born 1948)]
Hollow squares illusion. The figure is composed of identical perfect squares.