It's very simple and it has nothing to do with identifiable goals. It is to keep thinking about what architecture can be, in whatever form. That is an answer, isn't it? I think that S, M, L, XL has one beautiful ambiguity: it used the past to build a future and is very adamant about giving notice that this is not the end. That's how it felt to me, anyway. That is in itself evidence of a kind of discomfort with achievement measured in terms of identifiable entities, and an announcement that continuity of thinking in whatever form, around whatever subject, is the real ambition.

Rem Koolhaas Interview with Jennifer Sigler in Index Magazine, (2000)