In the period 2010-2013 Guy Cassiers directed the opera cycle Der Ring des Nibelungen by Richard Wagner. The musical direction was in the hands of the world-renowned conductor Daniel Barenboim. Der Ring des Nibelungen was a production of Teatro alla Scala and the Staatsoper Unter den Linden in Berlin, in cooperation with Toneelhuis.
Kurt d’Haeseleer created the videodesign for the opera cycle together with Arjen Klerkx.

