Forced perspective is a photographic optical illusion used to make objects seem different than their actual size.
Forced perspective is possible by the single lens of the camera. Unlike your eyes, which work in together to create depth perception, the camera only has one eye and no depth perception - it sees things as flat.
Photographs where one subject seems to merge with another and photographs which defy gravity are technically part of this genre of photography as well although they actually rely more on orientation and point of view than a true visual compression due lack of depth perception.
Forced perspective is possible by the single lens of the camera. Unlike your eyes, which work in together to create depth perception, the camera only has one eye and no depth perception - it sees things as flat.
Photographs where one subject seems to merge with another and photographs which defy gravity are technically part of this genre of photography as well although they actually rely more on orientation and point of view than a true visual compression due lack of depth perception.