Forced perspective

It is an artistic resource that uses the position of objects to make them appear to have different sizes than normal.

Usually, it is used to give the sensation of the existence of giant humans or miniatures.

Inefficiencies
The inefficiencies of this artistic resource are that objects are always superimposed over others (thus removing the sense of interaction between objects) and that in order to produce an image one has to be in the proper place with the right objects.

Trivia

 * The movie Attack of the 60ft. Centerfold used the forced perspective to simulate the size of the giganta, but their results were relatively disastrous compared to Attack of the 50 Foot Woman (1993), which used photomontages (or chroma).