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.

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