Use geometry to define real shapes

La metamorfosi, Escher 1968

Escher artistic expression was created from images in his mind, rather than directly from observations and travels to other countries. Well known examples of his work also include Drawing Hands, a work in which two hands are shown, each drawing the other.
The concept of this work is to morph one image into a tessellated pattern, then gradually to alter the outlines of that pattern to become an altogether different image.