A projector display navigation system operated by optic interference
Image credit: Photo by Pavel Danilyuk from Pexels
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- It is reasonable to imagine that a projector with touch screen functionality would have more utility in the long run for entertainment purposes.
- Interactive powerpoints so you don't have to time yourself per slide, that just causes anxiety and detracts from the presentation.
- Most schools use projectors for instruction in classes, allowing students to interact with learning material could be an aid to learning
- Raise one hand up- pause
- Two fingers moving across the screen- toggle a navigation pointer
- A flick of the wrist- next tab
 EP 0554492 Hans E. Korth: "Method and device for optical input of commands or data". filed on 07.02.1992
Hesseldahl, Arik (2002). "Typing On The Table". Forbes. Retrieved 2018-07-12.