The Crevasse
One of the most outstanding achievements in pavement painting must be this enormous crevasse painted by Edgar Mueller in Dun Laoghaire, Ireland for the Festival of World Culture in 2008.

This incredible painting is one of the best examples of optical illusion to date. You really do feel like you will fall into the abyss if you stand too close to edge. Perhaps he should have painted danger signs along the perimeter to warn people of the impending danger.