I like the DMD (https://en.wikipedia.org/wiki/Digital_micromirror_device) in DLP projectors: millions of tiny mirrors each of which is electrically controlled to move to a specific angle quickly on torsion hinges.

Yep, the entire field of MEMS is both outlandishly complex and fascinating. For those who are curious, take a quick look at https://courses.washington.edu/me557/nthu/mems.pdf, which gives a nice overview of the different mechanisms and manufacturing processes involved.