Conversation so far:
what did Rem Koolhaas propose about the European Flag?
The idea of a visual language inspired a series of drawings and drafts, including the Barcode
What kind of symbol was proposed by Rem Koolhaas to be used on the European Flag?
The barcode seeks to unite the flags of the EU member countries into a single, colourful symbol.
why did Koolhaas and his think-tank AMO decide to unite the flags in their proposal of the European Flag?
The barcode seeks to unite the flags of the EU member countries into a single, colourful symbol.
Was there any opposition to the Rem Koolhaas' proposal of the European Flag?
Critics pointed the lack of capability to relate the signified with the signifier, also the presented justification for the order in which the color stripes were displayed.
Was Rem Koolhaas' proposal of the European Flag successful?
During the Austrian EU Presidency 2006, it was officially used for the first time

Question: When did all this happen?
Self-contained rewrite: When did Rem Koolhaas' proposal of the European Flag happen?