A good and inspiring exhibition means interaction with the viewer. Alongside raising the visitors’ interest in the content of an exhibition, they will become truly involved if they can influence something, can act, and are stimulated and challenged. A good communications process is interactive if and when the visitor becomes both recipient and sender in the process. Interactivity challenges people to try something, to take the reigns, or to apply changes themselves. Eventually good interactivity influences the user’s thinking and acting. It is always a challenge for Kossmann.dejong to produce interactivity that feels natural and intuitive. By hiding the means, installations gain a magical dimension, stimulating visitors to take part.