Haruki Murakami said this quote

It was––how shall I put it?––a painfully solitary building. Let me explain. Say we have a concept. It goes without saying that there will be slight exceptions to that norm. Now, over time these exceptions spread like stains until finally they form a separate concept. To which other exceptions crop up. It was that kind of building, some ancient life form that had evolved blindly, toward who knows what end.