The Boom Tube is wood and acrylic with a pre-made LED strip that responds to sounds. It’s the usual infinity setup: a mirror in the back, one-way mirror in the front, with a piece of clear thick acrylic over it to protect it from prying fingers.
The cylinder is just a set of 3/4 plywood rings (and boy is plywood getting uglier and more expensive by the day).
Here’s a demo with a little music:
I also posted a full build video here: