The phrase "ephemeral things" refers to objects, experiences, or ideas that do not last for a long time. They are temporary, fleeting, or short-lived. Full definition
The Revolt of the Sage is an example of what the artist would call a «metaphysical interior», and yet its crowded pictorial space overflows with ephemeral things: frames, measuring devices and biscuits. (blainsouthern.com)
At times, Oakoak uses photography and timing to turn ephemeral things like a ray of sunlight into yet another street artwork. (treehugger.com)
Another reason someone might want to turn stacks of money into a wristwatch is that ephemeral thing called provenance — the possession of something with a link to history. (bookbrowse.com)