The book -Wabi-Sabi for Artists, Designers, Poets and Philosophers by Leonard Koren, published by Stone Bridge Press in Berkeley, contains the best description and explanation of this Japanese concept I have ever read.

Nothing stands still. Everything is in the process of either waxing, growing, being born, or waning, shrinking and dying…

Those not busy being born R busy dying – Bob Dylan
When U stop learning U begin 2 die……