It's the aberration effects that were the most unintuitive for me. Specifically the difference when you are looking straight ahead in your direction of travel i

It's the aberration effects that were the most unintuitive for me. Specifically the difference when you are looking straight ahead in your direction of travel in how the stars appear to move when you are moving at constant speed and when you are accelerating. At constant speed when a distant star first appears it moves directly away from the center point. When accelerating distant stars first move toward the center point then move away. If you constantly increase the acceleration you can hold a star that is not at the center point stationary for a while, which is totally not something I would have expected. I'd like to see something like this except instead of a seemingly random assortment of stars the stars are on a regular grid, connected by glowing filaments along the grid lines. That would make it easier to see what the heck is going on.