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@futurebird I don't think this is necessarily too technical, but it might be. The era of reionization, when the universe became transparent ("optically thin") in visible light and once again visible to a human observer, is a really cool concept. It lends itself really well to demonstrations of the way stars and galaxies formed.

https://www.youtube.com/watch?v=kifF3RYcfn0

This is a viz of a simulation of reionization and it's really evocative. (We simulate universes as periodic cubes, thus the boxiness.)