Pro tip: When you pour mercury into one and plug it in, like I did at 12, it catches fire in about 20 seconds.
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Good to know!
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I still have one of these from my childhood.

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That's so cool. It was my favorite toy growing up
b/c it allowed you to make little light art installations and they all came out beautiful no matter what. Light filtered thru colored plastic is genuinely mesmerizing.
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