A slower speed of light [1] is the only game that has ever given me motion sickness, and that was without VR. I'm struggling to imagine what this would do to me.

The paper [2] (pdf) has some neat visualizations and introduces the math behind the VR visualization in the form of exercises, left to the reader to work out (thankfully, there are solutions at the end, for the lazy).

[1]: http://gamelab.mit.edu/games/a-slower-speed-of-light/

[2]: http://captaineinstein.org/wordpress/wp-content/uploads/2018...