Optical illusion of a girl tried for pedestrian safety

In lieu of speed bumps, or humps if you prefer, a safety campaign in Vancouver is trying a 2-D optical illusion painted on the street to see if drivers slow down and become more aware of children. The image of a girl chasing ball apparently becomes more visible to drivers as they approach. There's some fear that drivers will freak out and swerve, possibly hitting live 3-D children in the process, but the testers don't think so. The experiment is getting so much worldwide attention — "a crazy amount of attention," say the organizers — they have clarified some misconceptions. As for drivers who can't detect the illusion, as Discover magazine notes, "It’s a static image. If a driver can’t respond to this appropriately, that person shouldn’t be driving."