how cool is this?

This billboard is brilliant! is uses shadows generated using sunlight so when the sun is out you see an image of a girl sun bathing.

"The billboard is made of 12,148 aluminium pegs, varying in length from 1mm to 27mm. Each different length peg creates a different sized shadow. The different sized shadows create a greyscale image of a woman sunbathing, when the sun comes out."