The second reason is, that imperfection is in some sort essential to all that we know of life. It is the sign of life in a mortal body, that is to say, of a state of progress and change. Nothing that lives is, or can be, ridgidly perfect; part of it is decaying, part nascent. The foxglove blossom,--a third part bud, a third part past, a third part in full bloom,--is a type of the life of this world. And in all things that live there are certain irregularities and deficiencies which are not only signs of life, but sources of beauty. All admit irregularity as they imply change; and to banish imperfection is to destroy expression, to check exertion, to paralyse vitality.
– John Ruskin, The Stones of Venice