Conversation so far:
What was Rem Koolhaas' project on the city?
Three books starting with 720-page Mutations, followed by The Harvard Design School Guide to Shopping (2002) and The Great Leap Forward (2002).
What did Rem Koolhaas' Project on the City entail?
The books involved Koolhaas's students analysing what others would regard as non-cities.

Question: What do you mean by non-city?
Self-contained rewrite: What do you mean by non-city within Rem Koolhaas' Project on the City?