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Size Illusion This
illusion called Sarcone’s Crosses contradicts Ebbinghaus
illusion and Obonai square illusion (fig.
2). Sarcone's cross illusion consists of a cross (the
test shape) surrounded by sets of squares of distinct
size (the inducing shapes). As shown in the diagram
opposite (fig. 1), the 2 red crosses are exactly the
same size; however, the one on the left (surrounded
by large squares, fig. 1.a) tends to appear larger.
In Obonai square illusion
is exactly the contrary!
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A. Sarcone and Marie J. Waeber, designers and writers,
are specialists in creative learning. They create and invent
educational manipulatives and thinking games which help teach
mathematics, visual and plastic arts. Their maxim is: be
curious first! (click here to
get more info about the authors).
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