this article in Urban Times. The art that he created during his descent into dementia very graphically tells the tale of his disease.
'All right,' said the Cat; and this time it vanished quite slowly, beginning with the end of the tail, and ending with the grin, which remained some time after the rest of it had gone.
'Well! I've often seen a cat without a grin,' thought Alice; 'but a grin without a cat! It's the most curious thing I ever saw in my life!'
~Lewis Carroll, from Alice's Adventures in Wonderland
[sorry, accidentally had Comments turned off... fixed it]