In Japanese Buddhist thought, mujō names impermanence: things arise, change and pass away. The aesthetic ideas that follow have different histories and meanings.
Mono no aware is the tenderness or ache stirred by things because they pass. Cherry blossoms are a familiar example, though not the only one.
Wabi came to value restrained, unshowy sufficiency, especially in the way of tea.
Sabi can name the quiet beauty, patina and solitude of things marked by age. The two words are now often joined as wabi-sabi, especially outside Japan, but they have distinct histories.
Yūgen points elsewhere: towards mysterious depth suggested rather than fully revealed, like mountains half-seen through mist.
These are artistic and philosophical traditions, not a personality shared by everyone in Japan.
In the bath, watch steam dissolve, water settle and light move across old wood. You do not need to name the feeling. Simply notice how change can make a moment more precious.
TAKE IT WITH YOU
Notice one changing detail without needing to name or photograph it.