I have a thing about drawing skulls and bones. Not of any morbid fascination (I think), but because they can really be a challenge. The texture and colour of bones are interesting, and the ultimate challenge is to draw a skull first with graphite on white paper, then with white pencil on black paper. This ...

(I was horrified to discover that Wikipedia does not have an entry on Fritz Kahn in English. I was utterly unaware of how deep into obscurity this multitalented man had fallen. Update: my pigheaded ability to pester strangers have resulted in an solid entry on Kahn on Wikipedia. Many thanks to Yngvadottir ). Fritz Kahn (1888-1968) ...

Over at http://rangelmd.com/ there is this genius post: Human anatomy as subway map ...