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Mono no Aware is a concept that basically means 'a sensitivity to things'and it is related to all art forms. It is a key element to understand Japanese culture.
The term aware emerged during the Heian Period to describe the sensitivity towards the ephemeral things (like knowing the beautiful cherry blossoms will not last forever) and nostalgia for people (longing for a lost love).
The full term was developed during the Tokugawa Period (1603-1868) by Motôri Norinaga, member of the Kokugakushu (National Studies Scholars). For Norinaga, what defines the Japanese culture is the unique capability of perceiving reality, nature and objects without the intervention of others; thus developing empathy, which helps understanding reality.
So, through language, this connection can take place. The result of this connection can derive in a Haiku, an Ikebana arrangement, etc. : every art form or cultural expression is a way of experiencing reality and the connection to the world.
Mono no aware also establishes that beauty is subjective, not objective. Beauty is an state, not an experience.