The floors of the machine rooms in the Rijnstate Hospital in Arnhem are cleaner than the kitchen floor in many households. This is not an optical illusion explained Bert van Hal, Chief of Technical Services: "I also had the machinery repainted in a lighter shade of yellow. Not only because I think it looks pretty, but because the oil can be seen more easily. There are our showpieces. So, you can believe that we keep them really clean."