Assume that I have a camera obscura (with a large lens - something like a magnifying glass) setup projecting an image of some still life. I look at my projection on my projection plane and I see one specific perspective of the still life. Moving or rotating this plane around does not change the perspective, only the focus.
Now I remove the projection plane and place my eye a few steps back from where the projection plane was. According to the answers to my previous question, at this distance, my eye will see a virtual image of the still life inside the lens. If I move my head from side to side, I now see different perspectives of that same still life. For example, in this head position, the orange is completely covering the grape. Or, moving to this head position, the jacket in the background moves from the right to the left side of the bowl.
Why are these different perspectives possible, when all the light entering my eye is a sample of the same light that created the one-perspective-projection? Should not my eye just see different parts of the still-life image when I move my head around, and not different perspectives as well?