The aim of the Hospital clowning for child patients -practice is to affect the hospital experience of the child and the family and the memory that it leaves: to create a positive patient experience, to promote a satisfying hospital experience and to offer psycho-social support. The activity is nationwide and established. Hospital clowning has become an important part of university hospitals' operations. Expanding the practice would be easily feasible if resourcing was secured. There is plenty of experiential and expert knowledge, but there is less scientific knowledge