The dream of the fisherman’s wife
I remember I once saw a pornshoot with a girl and an octopus in a bathtub which I found very artistic and exciting. Today, I saw this amazing artwork on Linh Dinh’s weblog about the lower half of the human body:

The Dream of the Fisherman’s Wife. C. 1820. 6 1/2″ x 8 3/4″ by Katsushika Hokusai
What a touching image! There is more work of this artist on this website
http://www.akantiek.nl/hokusai.htm