The phrase "fleeting nature" means that something is temporary or doesn't last for a long time.
Sentences with «fleeting nature»
The murals here, seemingly simplistic, address pop culture as well as issues of race, class and the fragmented, fleeting nature of memory. (latimes.com)
It is impossible for these events not to prove the ultimately ethereal and fleeting nature of artworks. (themodern.org)
The abstract and impossibly fleeting nature of clouds played to his interest in form and texture, but even to Weston, clouds ultimately remain an elusive subject — free - association, subjective emotional reaction abound. (brucesilverstein.com)