An illusion room

The famous space called:  Ames room.
It is created by an American ophthalmologist Adelbert Ames, Jr. (1880–1955), who first constructed such a room in 1946. And his idea was come from a concept by the German physicist Hermann Helmholtz in the late 19th century.An Ames room is depicted in the 1971 film adaptation of the Roald Dahl novel Charlie and the Chocolate Factory. Also, production of The Lord of the Rings film trilogy used several Ames room sets in Shire sequences to make the heights of the hobbits correct when standing next to Gandalf.


The Ames room looks cubic when seen with one eye through a specially-positioned peephole.

                                         


However, the room's true shape is trapezoidal. " The floor, ceiling, some walls, and the far windows are trapezoidal surfaces; the floor appears level but is actually at an incline (one of the far corners being much lower than the other); and the walls are slanted outward, though they seem perpendicular to the floor. This mistaken shape makes it look as if people or objects grow or shrink as they move from one corner of the room to another. "

   Definition from Wikipedia.