Ephemeral

Ephemeral describes anything that lasts only a short while and is understood, even at the time, to be passing. A mayfly's afternoon, a chalk drawing on a sidewalk before the rain, the smell of someone's perfume in an empty lift: all ephemeral. The word is slightly literary and slightly wistful. It does not mean simply short or brief; it implies that the brevity is part of the meaning.

Things that are ephemeral often gain their value from the fact that you cannot keep them. The cherry blossom is celebrated precisely because it is ephemeral: a week of pink, then gone for a year. The same flower in plastic, kept on a windowsill for a decade, is something else entirely.

— A medical word, once —

Ephemeral comes from the Greek ephēmeros, literally "on, for, or lasting a day". It is built from epi, meaning "on" or "for", and hēmera, meaning "day". The Greeks used it as a medical term: an ephēmeros was a fever that ran its course in twenty-four hours. Hippocratic writings refer to ephemeral fevers, and the word travelled into Latin medicine as ephemera.

The English adjective is first recorded in the 1570s, initially in the same narrow medical sense; by 1620 writers were applying it more broadly to anything short-lived. The biological connection survives in entomology: an ephemeropteran is the order of mayflies, named for adults that often live only a day or two after emerging from the water.

"Things that are ephemeral often gain their value from the fact that you cannot keep them."

— Two parallel careers —

In biology the word stayed technical. Ephemeral streams flow only after rain. Ephemeral plants race from seed to seed in a few weeks of desert spring. Mayflies (the order Ephemeroptera) live, as adults, for hours rather than days. The mayfly's biology is pinned to the meaning of the word: the adult often has no functional mouthparts, because it is not built to eat — only to mate, lay eggs, and die before nightfall.

In the arts ephemeral has been a quiet flag for whole movements. The Japanese aesthetic of mono no aware, the gentle sadness at the passing of things, is often translated into English with this adjective. The British land artist Andy Goldsworthy builds sculptures of ice, leaves and balanced stones so that the camera will record what the wind, the tide or the warming sun will quickly erase. Snapchat made a multibillion-dollar product out of ephemeral images, betting that people would say things in pictures if the pictures did not stick around.

— The librarians' sense —

Librarians use the word in a third sense: ephemera as a noun (often plural) refers to printed matter that was never meant to outlive its moment — train tickets, theatre programmes, election leaflets, takeaway menus, matchbox labels. Some of the most prized objects in archives today, including the only surviving copies of certain Shakespeare playbills and early labour-movement leaflets, are exactly these things, kept by accident because a single collector refused to throw them out.

The word, in other words, has a habit of outliving itself. A small army of archivists is paid every year to make sure it goes on doing so for at least one more generation of researchers. There is a quiet irony in that: the things we name ephemeral are sometimes the very things we work hardest to keep, once we realise that the moment they belonged to has gone for good.

That irony is built into modern life. Every photograph on a phone is, in principle, ephemeral and, in practice, copied to three datacentres before the user has closed the camera app. Snapchat invented a product around the promise of disappearance, then spent years explaining to regulators that the disappeared messages were not always quite as gone as advertised. The cherry blossom still falls on schedule. The mayfly still dies before nightfall. But the things we used to lose without thinking — a voicemail, a graffiti tag, a Tuesday afternoon — now leave a trace whether we want them to or not. The word survives because we still need it to mark which kind of brevity is meant: the kind that fades, or the kind we have only pretended will.