There’s a different kind of graffiti that uses the actual street as a canvas and adds a whole new dimension. It’s called three-dimensional street art, and it’s out of this world. Normal graffiti looks like a flat, two-dimensional picture, but three-dimensional paintings appear to be coming right out of the surface. Many people have already experienced 3D animation at work in James Cameron’s latest sci-fi hit movie, Avatar. With 3D street paintings, you don’t even wear 3D glasses.Imagine walking up to a crack in the icy surface of the Earth. Go one step further and you will fall into the freezing water hundreds of meters below. This is the kind of thrill you get when you see the incredible piece called the Crevasse by Edgar Mueller. Of course, you know it is just a painting. Mueller knows that your eyes can trick you mind, so his painting makes you wonder for a moment if the ground has actually disappeared. This incredible painting is one of the best examples of optical illusion to date. He spentfive days, working 12 hours a day, to create the 250 square meter image of the crevasse.Mueller, a German artist, is one of the best known 3D street painters in the world. The huge street serves as his canvas, and he uses chalk or washable paint to make his masterpieces. Another features an enormous shark with its mouth open, bursting out of a brick floor and ready to seize passersby. Using great skill and patience, Mueller, along with other talented 3D street artists, are adding a new dimension to graffiti.Which of the following is an example of an optical illusion?
(A)A cellphone with a hidden button.
(B)A painting of a shark devouring its prey.
(C)A shirt that has a tie printed on it to trick you.
(D)A person drawing a picture on the street.