Laser light shows have ... this homebrew X-Y laser projector. This is actually [Stanley]’s second pass at a stepper-based DIY projector; we featured his previous build back in 2016.

First, to build your ... gain (how much light the screen reflects back). Therefore, would it be cheaper to tack up a white bedsheet to your wall rather than pay for a premium projector screen?

It's one reason why Hisense has been pushing the idea of its laser TVs, which are basically ultra-short throw projectors with streaming tech built in, that come with a matching ambient light ...