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

Discussion (449 points, 4 months ago, 83 comments) https://news.ycombinator.com/item?id=44996938