this post was submitted on 08 Sep 2023
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Compass & plexiglass or plastic CD cases, as shown in the video.
Amateur Science doesn't seem to be hosted anymore, but here's an archived copy of the page if you wanna read the instructions: https://web.archive.org/web/20111108131359/http://amasci.com/amateur/holo1.html & https://web.archive.org/web/20111117234715/http://amasci.com/amateur/holohint.html#0
thank you!