What Happened to 'Miegakure,' the Game That Promised the 4th Dimension? (2018)
I exchanged a couple emails with him years ago, as I wanted to share an interface I designed for viewing 4D (or higher) geometry. It runs in the browser and you can try it at 
http://transdimensional.xyzThe each column is a slider with previews of how it will look when the slider is rotated