When the spreadsheet program Lotus Improv for NeXTSTEP was released in 1991 I couldn't even imagine affording a NeXT workstation it ran on. The software was impressive but available information was limited in the computer magazines and other hobbyist sources I had access too, so I knew little of Improv. This deep dive by Stone Tools @stonetoolsblog is what I always needed to learn what this software can do. https://stonetools.ghost.io/lotusimprov-next #LotusImprov #NeXTSTEP #spreadsheet #retrocomputing