You're probably looking for something like Sudbery 1977, https://dougsweetser.gi...

		jacobolus 5 months ago \| parent \| context \| favorite \| on: Visualizing quaternions: An explorable video serie... You're probably looking for something like Sudbery 1977, https://dougsweetser.github.io/Q/Stuff/pdfs/Quaternionic-ana... (published 1979, doi: 10.1017/S0305004100055638)

Fantastic. Thanks for the reference.