Ink and pencil
Alex Kaiser (kishlahar)
Designed by Alex Kaiser, the Ex Libris of Kaiser family is based on impossible figure from artwork with impossible wheels by Sandro del Prete.
Artist's site http://www.alextheartist.com
Artist's deviantART profile http://kishlahar.deviantart.com
The image was found at http://kishlahar.deviantart.com/art/Ex-Libris-Impossible-4376303