Visitors are taking part in creating exhibitions in science centres around the world. This collaboration can be done in many ways. We will focus on two: First, science centres created mainly through public engagement and, second, projects in which visitors are asked to invent an exhibit. The aim of the session is to learn good practices and dead ends when engaging the public in building science centres, exhibitions and exhibits.During the workshop we will exchange experiences, work out a prescription for a good public engagement, and list the approaches to avoid.