1. Centrum Wiskunde & Informatica, Amsterdam, The Netherlands
2. Rijksmuseum, Amsterdam, The Netherlands
3. Rijksmuseum and University of Amsterdam, Amsterdam, The Netherlands
4. Centrum Wiskunde & Informatica and Eindhoven University of Technology, Eindhoven, The Netherlands
5. Centrum Wiskunde & Informatica and Leiden Institute of Advanced Computer Science, Leiden, The Netherlands