What is the Spiegel Tent doing at the top of Holland?

What is the Spiegel Tent doing in a park in Groningen? I am used to seeing it from time to time set up out the front of the National Gallery of Victoria in Melbourne, Australia! Well its part of The Noorderzon festival. Here are a few photos taken at dusk on Day 2 of the festival. Day One was a bit of a wash out, with wind & rain keeping the crowds away.

* The top of Holland was a former catch phrase to promote Groningen.