Uploaded June 2023 | Updated September 2026, 2 weeks ago

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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: winnetkahistory.org/gazette/j-is-for-jungle-gym

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