Aral Balkan Retweeted Sally Stone
And more background — neat! :) http://m.nrc.nl/nieuws/2014/11/16/eschers-impossible-stairs-inspired-by-high-school/ …https://twitter.com/sallystone/status/619213768283824128 …
Aral Balkan added,
8:38 AM - 10 Jul 2015
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