Dutch street artist Jan Is De Man was asked by residents of an apartment building in Rtrecht, Netherlands, to bring something positive to their neighborhood. At first he thought of a smiley -- a very big smiley, but it said that project "felt too simple."

After studying his "canvas" he came up with the idea for a l'oeil mural, a artistic visual illusion. "I studied the shape of the house and its location, and the idea of painting a huge bookcase hit me," he said. He painted books that are favorites of the building's residents. He says, "I like to see smiles on people's faces at this idea."