The Ames room It was invented by the American ophthalmologist Adelbert Ames, Jr. It is constructed in such a way that when viewed from the front, it appears to be a common room with a cubic shape, with a back wall and two sides parallel to each other and perpendicular to the horizontal plane of the floor and ceiling. . However, it is a visual perspective trick since the room is actually trapezoidal: the walls are inclined just like the floor and ceiling, and the right corner is closer to the front observer than the left corner (or vice versa).
As a result of an optical illusion, a person standing in one corner appears in observation to be a giant, while a person standing in the other corner appears to be a dwarf. The illusion is quite convincing, since a person walking back and forth from the left corner to the right seems to increase or decrease.
You can find more information on Wikipedia