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===Point based===
===Point based===
===Ray based===
===Ray based===
+* [[Projector]]
+
===Interference pattern based===
===Interference pattern based===
Interference based gadgets are also called holographic gadgets. The display gadget modulates light as in wave optics that interferes with itself and forms a pattern at some distance. This is the rarest type of device.
Interference based gadgets are also called holographic gadgets. The display gadget modulates light as in wave optics that interferes with itself and forms a pattern at some distance. This is the rarest type of device.