To improve on the classic school trip to the museum and the traditional distinctions between formal and informal learning, every year we run a project where the schools (first the teachers and then the pupils) are actively involved right from the very first stages of planning. The various projects realised so far involve schools with children of different age levels, from kindergarten to high school, and aim to provide a rewarding museum experience for each level. The various phases of each project follow a timeline where the specific roles of each group of actors is set out. All our projects rely extensively on history of science, but in a number of ways: using primary and secondary sources, museum exhibitions, multimedia and hands-on reconstructions of historical experiments. We mix all these resources together to offer a historical route suitable to the various age groups. Creative analogical thinking, iconographic similarities and coincidences between the scientific and artistic domains are encouraged especially with children from 3 to 13 years old. These comparisons become pretexts for analysis, reflection and creative production also at the graphic level. In this paper we outline our methodology in the specific case of a laboratory and exhibition experience built around the person and work of Galileo. One of the results has been the involvement of the pupils in a new, unexpected emotional experience.