(Got curious if it was officially credited, found it was) Item #8 at https://www.wolfram.com/mathematica/scrapbook/ https://www.wolfram.com/mathematica/scrapbo

(Got curious if it was officially credited, found it was) Item #8 at https://www.wolfram.com/mathematica/scrapbook/ https://www.wolfram.com/mathematica/scrapbook/ """" 1987: The Mathematica front end begins to take shape… [screenshots] (Theo Gray invents cells and groups… and other things still seen today…) """