Julian Beever is an English artist who creates 3D trompe-l’œil chalk drawings on pavements since the mid-1990s. He uses a projection technique called anamorphosis to create the illusion of three dimensions when viewed from the correct angle. It is often possible to position a person within the image as if they were interacting with the scene.
Beever first designs his work on paper. Once finalised a camera is placed at a distance from the art on the pavement, which he returns to in order to observe the image through the lens a number of times as the camera’s wide angled lens can create an optical illusion which distorts the actual size of objects.
Source: Wikipedia
Julian Beever’s 3D street art - The last picture showing the lobster from a “wrong” angle





