Typically a hologram is a photographic recording of a light field rather than an image formed by a lensthe holographic medium ie the object produced by a holographic process which itself may be.
![](https://images.freeart.com/comp/art-print/fa4855296/tunnel-optical-illusion.jpg)
Abstract optical illusion shapes.
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A hologram is a physical structure that uses light diffraction to make an image the image can appear to be three dimensional.