The process of distorting the perspective of an image to
such an extent that its normal appearance can only be restored by the observer
completely changing the way he looks at the image. In catoptric
anamorphosis, a curved mirror, usually of cylindrical or conical
shape, is used to restore an anamorphic picture to its undistorted form
(see illustration). In other kinds of anamorphism the observer has to change
her viewing position – for example, by looking at the picture almost
along its surface. Some anamorphic art adds deception by concealing the
distorted image in an otherwise normal looking picture.
At one time, artists who had the mathematical knowledge to create anamorphic
pictures kept their calculations and grids a well-guarded secret. Now it
is relatively easy to create such images by computer.
AND IMPOSSIBLE FIGURES