I like how PS1 did 3D differently than pretty much any other system ever, which is why if you look long enough at a model, you will see it warp and contort weirdly as vertexes jump between points because it didn't have floating point numbers or something like that (can't really remember the technical details).

It's super unique and faking this effect in modern engines is pretty neat. It's also weird playing on some PS1 emulators that don't have this effect, because it's better than original hardware.