It's fun to analyze the physics of anime, which govern everything from the properties of Pokeballs to the unique effects of gravity on oppai. There's that tendency of eyebrows to be visible "over" a character's hair, allowing for accurate communication of emotions to the viewer without the hair getting in the way (nevermind that this is impossible), plus the ability of some characters to spontaneously expel gallons of tears or blood when crying or getting a nosebleed. Recently there's been a trend in characters wearing glasses, since moe is at its essence all about the little defects and imperfections in characters that make them charming, and what's cuter than really bad vision? Naturally there's a body of unique physical phenomena that govern glasses, for example their ability to "bend" light around the side of the frames so we can see the eyes of the characters from any angle. Characters who wear glasses frequently need to adjust them at dramatic moments, yet for some reason the glasses are somehow in no danger of falling off during combat. Then there's the "shiny lens effect" seen whenever a character starts receding into their own delusional world for some reason.
The strange physics of eyebrows and glasses in anime.