3D engine on MS Excel without VBA (2018) [video]
youtube.com
youtube.com
Another project watchers might find interesting is the top post on r/Excel, where someone made a video player in Excel because his machine was completely locked down.
https://old.reddit.com/r/excel/comments/2jtd2f/worked_on_a_c...
(Gwern has a whole list of accidentally/surprisingly turing-complete things at [2])
https://www.youtube.com/playlist?list=PLjIYRqpIFecpDSXqCOddU...
While I'd never use it for day-to-day anything, things like this are a really interesting way to show how things like HDR photography actually work. Excel can be very approachable for stuff like this.