Since I first heard of the monster group I have found the idea very Lovecraftian: a higher dimensional object that is so incredibly symmetric as to be incomprehensible.
"Fearless symmetry" by Ash and Gross is one of the most readable books on symmetry and group theory I've come across. They break with the pop science tradition of not using equations, and actually get into the nitty-gritty of the maths, while managing not to read like a maths textbook.
I started reading a book with an eerily similar title to this article[1] and it's quite a good read so far, similarly discussing symmetry, as well as the history behind the development of this theory.
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[1] https://www.amazon.com/Symmetry-Monster-Greatest-Quests-Math...