What is fun to think about is how to simulate Lorentz contraction [0] of lengths for a fast moving object. Might be a good tool to you with special relativity simulations.
Consider a train. If I estimate it's speed incorrectly the reconstructed image will either be contracted or stretched depending on the direction of error.
Also don't miss https://trains.jo-m.ch/#/trains/list by https://news.ycombinator.com/user?id=jo-m
[0] https://en.wikipedia.org/wiki/Length_contraction
