reading Lennards blog, I got to think of:

Johannes Holbek, an almost forgotten danish artist who died 31 years young in Paris, suffering from serious scizofrenia. Befriended with especially dansih sculptor Rudolph Tegner, Holbek was a mulittalented artist, not the least a very sharp minded satiric cartoonist

http://www.vejenkunstmuseum.dk/Dansk/samlingen/jenslund/kunstnerne%20om%20hinanden.htm