Neocities.org
I think there' s something quite nice about how a dedicated community can take something that seems simple on a surface level and go incredibly in-depth with it. Like Rubik's cubes or marbles.
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The children who compete in Rubik's cube speedsolving competitions organized by the World Cube Association are surprisingly knowledgeable about the official standards and rules.
Pens and stationary! It's a huge rabbit hole when you get into it.