"Mono no aware" Is a Japanese word with no translation in English.
It means: "the bittersweetness of a brief and grading moment of transcendent beauty".
This phrase is meant to talk about a heightened appreciation of the beauty in things and evokes a gentle sadness when it goes away, especially since nothing lasts forever.
Pictures taken in my neighborhood at Taito Ku, Tokyo.
Text source: Martunique for EF.