After the discussion of adding WYSIWYG text editing to Emacs, I'm amused to discover there's an elisp spreadsheet: http://t.co/bKI9b9Z5Oj
miniblog.
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Croquet was a 3D world written in Smalltalk. There's a promo video here: https://www.youtube.com/watch?v=mOZPW8l85eI
It's very exploratory, but the demos of a spreadsheet(!) with the 3D graphing and a live video avatar are really cute.
At worst, the mutability of Emacs promotes a spreadsheet level of s/w engineering. At best, it's a full-blown lisp machine with a fast CPU.
Eve (the programming language/spreadsheet/wiki language) keeps developing: https://incidentalcomplexity.com/2016/06/22/mar1/ (a radical rethink of computer utility)