Overhead Projectors

i found one of those Overhead Projectors, like the ones they use in classrooms and they use the transparencies. i took the lens, and its like 2 inches thick!(its not multiple lenses in a fixed rig, i beleive its one thick lens). so i put the lens on the table above 5 feet under a celing lamp. i looked into the lens, but a little to the side so the light still hit the lens and i saw a 3d image. it was kinda the same image, but if i tilted the lens whichever way, the relfection closest to me and farthest from me moved. there are like 6 reflections, 3=no tint, 3=yellowish tint like the color of a regular incandescant bulb. but its like an image that can be moved. is it a hologram? and its like a 3d movie image,( like with the glasses) if you reach for it, the same illusion happens. it always appears to be inside the lens cuz you cant touch it, but if you move your hand, it is like 2-3 inches behind the back of the lens. sorry if this is confusing

There seems to be a whole group dedicated to questions like this, and maybe able to help, at the link below.

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