M. C. Escher Drawing Hands, 1948 Lithograph, 28.2 cm × 33.2 cm (11.1 in × 13.1 in)
It is a simple piece of art, but verry difficult in itself. It would be easy in digital art to make one hand or subject and copy it to the other side but it was not so. The art shows the talent of the artist. The art you look at and only have to guess whitch hand was first or whitch one started to make the other one first. Its pritty perplexing, or just something to think about at the end of the night.