The first jungle gym was meant to hack kids' brains

Well before the first climbing frame was patented as "jungle gym", mathematician Charles Hinton thought they might be able to teach kids four-dimensional thinking. Thanks to the Winnetka Historical Society! More from them: https://www.winnetkahistory.org/gazette/j-is-for-jungle-gym/

Original patents referenced:
https://patents.google.com/patent/US1471465A/
https://patents.google.com/patent/US1488244A/
https://patents.google.com/patent/US1488245A/
https://patents.google.com/patent/US1488246A/

Also referenced is "Winnetka: The history and significance of an educational experiment", by Washburne and Marland.

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