Hoa Hakananai'a means "stolen or hidden friend" in the indigenous language of Rapa Nui. Hoa Hakananai'a is rare in that it is carved from basalt. The hardness of the basalt has maintained a lot of the decorative detail that has been lost from many of the other statues on Rapa Nui.
A set of Van Gogh works with links to hi-res versions. There are a number of more interesting pieces you don't see very often here - like Stuffed Bat and Skull with Burning Cigarette. Some drawings, too.