the constant movement in your peripheral vision nearby and far away that makes it bad. It's not just you, that stuff is in our biology. Even worse than motion

the constant movement in your peripheral vision nearby and far away that makes it bad. It's not just you, that stuff is in our biology. Even worse than motion in your peripheral vision is activity behind your back (e.g. people walking by). Unknown action (sound/vibrations) behind our back triggers our flight reflex, which is very hard to suppress.