The Ames room is a bit of clever trickery designed to fool the eye.
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Ames room illusion misperception caused by viewing objects through apeephole in a trapezoidal shape room that is much longer and higher on one side than the other assuming it is a normal
tricked by secondary monocular depth cues.
Psychology - Ames-room
This illusion, which makes use of the misperception of distance, was
designed by Adelbert Ames. It is a specially contrived room which is built
with a trapezoidal rear wall and a sloping floor and ceiling. When viewed
from a certain point, it looks like an ordinary rectangular room. But in
reality, the left corner of the Ames room  is taller and farther from
the viewer than the right. Hence, a person standing in the left corner
appears very small, whereas one standing in the shorter and nearer right
corner looks like a giant. Furthermore, if a person walks across the room
from left to right, the viewer is faced with a conflict. If the viewer
maintains shape constancy, they continue to perceive the room as square and
if they maintain size constancy,  they can refuse to see the person
'grow'. Most people maintain shape constancy  and as a result perceive
the person to 'shrink' and 'grow' as they walk from one side of the Ames
room  to the other.
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