Anywhere and everywhere you go in Amsterdam, at some point you'll run into the Space Invader:

Invader is actually an artist who leaves these strategically placed mosaic's of little alien ships (inspired by the old game space invaders) in cities all over the world.

Apparently down in southern France, in the city of Montpellier, invader placed them so that when you see them on a map they make one big space ship.

Anyway when you get here, keep a sharp eye out, you'll find invader's work on many random street corners on the side of buildings, bridges, and who knows what else. I'm getting into the habit of snapping pictures of the invaders whenever I run into them... maybe you will too.