The ephemera's lifespan was so... that it measured its life by...?

The ephemera's lifespan was so fleeting that it measured its life by the brief moments of joy it brought to those who encountered it. Each vibrant flutter and delicate whisper in the wind encapsulated the essence of impermanence, reminding viewers to appreciate the beauty in transience. In this way, the ephemera lived not in days or years, but in the cherished memories it left behind.