pluto is not a spreadsheet though. Observablejs just got support for Excel and Google sheets, which is really interesting and probably the closest thing to an

pluto is not a spreadsheet though. Observablejs just got support for Excel and Google sheets, which is really interesting and probably the closest thing to an integrated reactive spreadsheet/notebook concept: https://observablehq.com/@observablehq/release-notes#cell-801 https://observablehq.com/@observablehq/release-notes#cell-80... ironically, I remember seeing features like what I'm thinking of, which was first spreadsheet I ever used- Wingz: https://en.wikipedia.org/wiki/Informix_Wingz https://en.wikipedia.org/wiki/Informix_Wingz it had a mode where you could take portion of your cells and make it flow exactly like a notebook