The first time you go to a place everything is new to you. Then on repeat visits  some aspects  become familiar. Around the train station I usually stay in Seoul once a year there's a descent of insects we call "Tinkerbell bugs" but I've since learned are called ephemera orientalis a sub-species of the mayfly. Up close they are delicate and beautiful, a thin body flanked by paper-thin wings. Like something a comic-book artist might dream up. But when they appear in the numbers they do they seem to be treated like a biblical plague.  As far as I know they do no harm and don't live that long, so what's the point of them? What purpose do they serve? For most people they are an obvious nuisance to be eradicated or avoided  - swatted away. They are trampled underfoot and zapped by electricity. Massed together on walls or windows, and along escalator handrails they feel like a stain to be removed. But individually they seem a little helpless, fluttering their oversized wings in vain seeming to exist only for us to stop and take notice of them.  

https://www.youtube.com/watch?v=Gn5rOnIi120