This is just cool. Dan Hanna has taken two pictures of himself every day for 17 years. Two photos, 180 degrees apart with his head aligned with the position of the sun. All very carefully set up.
The result is a time-lapse film of his face, head, and hair over time. The music is a nice touch.
I picked this up, by the way, via the MAKE Magazine blog, which has led me to some neat stuff lately.