Anyone who likes the trippy views that a kaleidoscope shows ought to pick up a teleidoscope. It has the same internal reflective structure, but instead of colored bits of glass/plastic at the end, it has a fisheye lens to the outside world. They're quite fun to look through, since you get to pick from an endless array of shapes and color palettes by just pointing it at different things. A bit of searching will turn up shopping results for under $10.
I only found out about them well into my 30s, and was so enamored by the one my friend showed me that he let me keep it. It's enchanting.
There's also the pseudoscope, which reverses one's depth perception. I can grasp the concept, but I have real trouble imagining what that experience is like. I was unsuccessful in ever finding one for sale, until just now! https://www.grand-illusions.com/collections/optical-illusion...
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[ 3.1 ms ] story [ 47.4 ms ] threadhttps://en.wikipedia.org/wiki/Teleidoscope
There's also the pseudoscope, which reverses one's depth perception. I can grasp the concept, but I have real trouble imagining what that experience is like. I was unsuccessful in ever finding one for sale, until just now! https://www.grand-illusions.com/collections/optical-illusion...