Russian stacking dolls, though it doesn't deviate far in spirit from his usual work. Along with a few dozen other artists, he'll be creating a Pixies-inspired work for an art exhibit in Venice, California, titled "Dig for Fire" (named after the Pixies song, as you esteemed rock historians likely guessed).
The show is taking place at the C.A.V.E. Gallery and runs September 9 through October 1, so you'll have a few weeks to head over and peruse the art. We'll probably check it out -- fingers crossed that there's no homage to "Wave of Mutilation!"