Maybe some CP egghead scientician can elaborate on this or make this sound better, but my take is that despite a movie screen being a 2-D image, we are in effect "seeing" it as a 3-D image. Or brains are interpreting it as a 3-D world and we then essentially see it that way, with length, width and appropriate depth.
With perhaps a rare exception, the 3D images presented in a movie seem exaggerated and unnecessary. While the goal is realism, it actually generally comes across as more phony and distracting.
I do recall seeing Gravity in 3D and thinking it worked pretty well. Maybe that was because of the relative simplicity of the setting. A ship, a couple people, the earth below, and the vastness of space.
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