What you saw probably was the collection created by Nicky Case. Check his own explanations though https://ncase.me/ https://ncase.me/ and then also check http:/

What you saw probably was the collection created by Nicky Case. Check his own explanations though https://ncase.me/ https://ncase.me/ and then also check http://worrydream.com/#!/ExplorableExplanations http://worrydream.com/#!/ExplorableExplanations (and other explanations by Bret Victor)