Semi-transparent display using diffusor + projector

backlight

By projecting onto a partial diffuser, it’s possible to light-up a semi-transparent slab and make a semi-transparent display. An interesting effect that one sees is that areas with concentrated light perceptually seem less transparent (background washed out). This can be used to make simple transparent displays, or magical window effects without projecting directly onto the surface (and having a bright projector in the background).

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