Forced perspective is a technique that employs optical illusion to make an object appear farther away, closer, larger or smaller than it actually is. It is used primarily in photography, film making and architecture.
It manipulates human visual perception through the use of scaled objects and the correlation between them and the vantage point of the spectator or camera.
Apologies if the above sounds very technical, but it is! Creating graffiti like this takes some serious brain power and patience. It will require careful mapping and planning for perhaps a couple hours. There’s no mistakes when it comes to this line of work.