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

Original patents referenced:
https://patents.google.com/patent/US1...
https://patents.google.com/patent/US1...
https://patents.google.com/patent/US1...
https://patents.google.com/patent/US1...

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

MORE FROM TOM: https://www.tomscott.com/
(you can find contact details and social links there too)

WEEKLY NEWSLETTER with good stuff from the rest of the internet: https://www.tomscott.com/newsletter/
❓ LATERAL, free weekly podcast: https://lateralcast.com/    / lateralcast  
➕ TOM SCOTT PLUS:    / tomscottplus  
THE TECHNICAL DIFFICULTIES:    / techdif