In the top hat illusion an individual will fail to see two lines as the same length if one is placed horizontally so that it is dissected by the base of the other perpendicular line.

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The top hat illusion is a well-known optical illusion in which two lines of equal length appear to be different lengths when one is placed horizontally and the other is placed vertically. This is because the brain is tricked by the shape of the top hat into perceiving the horizontal line as being shorter than the vertical line.

In the Top Hat Illusion an Individual Will Fail to See