Their medium is chalk and flat public spaces. The results are seemingly three-dimensional, hyper-real images that blur the line between what is and what isn’t to be believed and give our perceptions a good headshaking. Applying the technique of trompe-l’oeuil (realistic images that create the optical illusion of three dimensions), Brit Julian Beever and German Edgar Mueller have brought pavement art out of their imaginations and into the street. Every day this week I’ll feature an image by one of these artists starting today with Julian Beever as above. Keep in mind these are flat surfaces and chalk!