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’.
What are some other things Rem Koolhaas is known for?
Rem Koolhaas is the founding partner of OMA, and of its research-oriented counterpart AMO based in Rotterdam, the Netherlands.
What color was the proposed European flag?
This idea inspired the Barcode. The barcode seeks to unite the flags of the EU member countries into a single symbol with a wide range of colors.
Anything else stand out in this article?
Rem Koolhaas won a Royal Gold Medal in the UK in 2004.

Question: What did else he discussed?
Self-contained rewrite: What else did Rem Koolhaas discuss?