'kagerou'
(It means 'Heat haze' and 'a mayfly'.)
Heat haze shows us a view like an illusion,
and mayflies are short-lived.
So we use a word 'kagerou' to express ephemerality of humanbeing, constructures, and every thing. In Buddhism, everything is considerd to be ephemeral.

My favorite football team Kashima Antlers was very strong, but its strength was 'kagerou'. I see the truth of Buddism here only to ... sigh ...
Another favorite football team of my town Kyoto Purple Sanga was very weak, but its weakness is not 'kagerou'. I can't see the truth of Buddism here, and ask .. 'why?'

A dragonfly looks like a mayfly.