(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 ). man as ...

These are drawn from a book with Leonardo da Vinci's sketches; all in pencil.There is no better way than to learn from the masters.   ...