Conversation so far:
What was the European Flag proposal?
Rem Koolhaas and his think-tank AMO – an independent part of OMA – suggested the development of a visual language.
When was the European Flag proposal proposed?
The European Flag proposal was brought up around the signing of Treaties of Nice in May 2001.
What are some things Rem Koolhaas is known for?
Rem Koolhaas is the author of ‘Delirious New York: A Retroactive Manifesto for Manhattan’.

Question: What else was he known for?
Self-contained rewrite: What are some other things Rem Koolhaas is known for?