Fidget cubes are fun. Apparently mine is a cheap Chinese knockoff, but I like it.
I also fiddle with anything. My keys, a portable universal remote (which I use to turn off the TVs with the news or advertisements), pens, anything really.
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Shedding your shell can be hard.
Diagnosed Level 1 autism, Tourettes + ADHD + OCD age 9, recovering Borderline personality disorder (age 16)