I wish I had been in Vienna in November 2006 - that's when this fantastic light show was created on the facade of the Karlskirche by two artists, Heiko Hofer and Alexander Nickl. (Needs Quicktime to run.)
This year, the same artists are lighting up the Essl art museum in Klosterneuburg. This isn't gentle son et lumiere - it's garish, geometrical, utterly wicked. Like looking at buildings through a kaleidoscope.