Are there any technical constraints for the artist?

We believe artists should have complete creative freedom; therefore, we don't impose any size restrictions for those who collaborate. The works can be gigantic, like Karel Appel's, or tiny, like Hans Hartung's. Every year, the artists take possession of the space and take hold of it in their own way.

The medium and format of the original works can vary quite a bit...

The artists who illustrate the labels are not only painters; they are also sculptors such as Bernar Venet or scenographers such as Robert Wilson. We love the diversity of these artists and their media. I was delighted when David Hockney created his work on an iPad.