I hope it's ok to post videos on this forum.
There are already many videos on youtube about DIY polarizers. I will show here a few specific tricks (smartphone polarizers, glass support, hair dryer, freezing wand, psychedelic field) and a lot of crystal growth.
Crystals start at 5:31
https://www.youtube.com/watch?v=Sobs7I79rhA
more DIY polarizer tricks & crystal growth
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