Today I'm taking a look inside this "disco laser" I found at a local thrift shop.

These are still available if you want one of your very own: https://pileofstuff.ca/r/shtnm

Here's Big Clive's look at a similar but fancier disco laser projector thing: https://www.youtube.com/watch?v=3jZHEmO_w5M

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This isn't the only way to do it. It's probably not the best way to do it. But it's how I did it.