A very simple 3D holographic projection technique using a clear plastic sheet is described in this instructable from mikroGanesh.
3D holographic projection
You will be amazed at the simplicity of this mechanism and its practicality. Use your smartphone to project 3D holographic images and videos without any modification or 3D goggles. Be mystified by images and videos popping over your smartphone!! All this from a piece of clear plastic sheet
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