Originally posted by TaoMaas It can't be. In 2D, those choices have already been made for you.
Not the perception, how we "see". That happens in our brain, nothing to do with what comes into it via the input devices, aka eyes. We interpret, we identify patterns and symbols for ideas of things. Its why we have to teach colors and letters to infants, its why 2 year old's have "Speak n Spells". We learn and build up the database. There are no outlined letters in the AT&T and IBM logoes but we see them as such, we perceive them to be letters. They're just a bunch of lines but their relationship allows us to complete the idea. Scatter the same lines all about and its meaningless. The composition of a photograph is the same.
Trompe l'oeil is an example of fooling the eye. Its why people instinctively jump from an image on a flat movie screen that seems to be heading right at them. Nothing comes out of the screen and we know it can't but we perceive it as possible.
One of the originators of Gestalt psychology in the 1920's was intrigued by movie marquees which appeared to move. They were made up of lots of individual light bulbs and none was moving but lighting them sequentially, it looked like they were moving.
We even "see" when its dark and our eyes are closed and we're unconscious, in our dreams. Vividly.
The point of their work was to try and understand our visual perception. How we decide things are related has nothing to do with 2D or 3D. Web and Graphic designers understand Gestalt principles very well. The same principles apply to how we read a photograph, how we perceive it.