A Mathematician’s Lament by Paul Lockhart (also referred to as Lockhart's Lament): https://www.maa.org/external_archive/devlin/LockhartsLament.pdf
The essay has been expanded into a book of the same name: https://amzn.to/2OvaBGl
Paul Lockhart has also written a book showing how math should be done: https://amzn.to/3rFSqvz
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End music: Gymnopedie - Satie