Not quite true..
There are quite a few tricks that our visual system plays, sometimes to prevent us from "seeing the truth". When it comes to building visual prosthetic for the visually-challenged group, the question is raised, is it necessary to maintain similar characteristics?
The answer is ...yes.
Here is one of the most common cases illustrated by J. C. Leyendecker
What's wrong with the picture?
(please don't scratch your head at the moment and think I am crazy...)
The rest of the background is black, and the man is also in black (default thinking)....there is not even a border line to illustrate the contour of the man's body.... your brain is virtually drawing the contour for you !
Our ancestors survived the harsh environment based on these common senses...it actually might drive us mad if we constantly question about "is the hand really the man's in the picture?'
However, the reversed thinking is very well known in the movie industry, even in the very early time...
Maybe this can reminds you a bit of it.... enjoy