Adam Miller said this quote

Typically, images or paintings are designated as anamorphic when, in order for the image to appear, a particular line of sight must be adopted. The image only shows up when approached from the angle dictated to the viewer by the image's own set of conditions. In this sense, the viewer must 're-form' their perspective to match the perspective demanded by the image. We are not free to approach the image as we wish; the image is free to assign us a perspective proper to itself... Anamorphosis, then, describes the freedom of the phenomenon to give itself as it wishes and it measures the extent to which this freedom turns the tables on the one to whom it appears. To receive a phenomenon as it wishes to give itself is to yield control and suspend our own timetables and preconditions in order to be faithful to the conditions set by what gives itself.