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Back to original question.
Laser projectors are a big draw for colors.
Lumia is also. It is easy, looks very cool and doesn't require much equipment for a decent display.
Check out this series for some basic ideas.
Beam shows - tunnels - spiros - etc.
https://www.youtube.com/watch?v=Imz7IYEJZJ4
There are lots of other reasons.
Holography, testing various things including size and frequency.
Laser projectors are a big draw for colors.
Lumia is also. It is easy, looks very cool and doesn't require much equipment for a decent display.
Check out this series for some basic ideas.
Beam shows - tunnels - spiros - etc.
https://www.youtube.com/watch?v=Imz7IYEJZJ4
There are lots of other reasons.
Holography, testing various things including size and frequency.