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Wabi now connotes rustic simplicity, freshness or quietness, and can be applied to both natural and human-made objects, or understated elegance. It can also refer to quirks and anomalies arising from the process of construction, which add uniqueness and elegance to the object.
Sabi is beauty or serenity that comes with age, when the life of the object and its impermanence are evidenced in its patina and wear, or in any visible repairs.

“ Since we already know what the “correct” design solutions are, wabi-sabi thoughtfully offers the” wrong” solutions. As a result, things Wabi-sabi often appear odd, misshapen, awkward, or what many people would consider ugly.” (Leonard Coran)

Western and Japanese notions of beauty, for example, lie in fundamentally different world-views that lead to distinct values and differing ways of defining aesthetics.

According to Leonard Koren in his book "Wabi-Sabi: for Artists, Designers, Poets and Philosopher."