Helping children to visualise what is inside them and how their bodies work can be a challenge, since teachers are often reliant on secondary sources or investigations that can only measure outward signs (such as pulse rate). Another way is to involve the children in an imaginative role-play exercise where they explore the insides of a "giant" who happens to have the same biology as their own just on a bigger scale! Author Dan Davies describes and evaluates the immersive experience that MakeBelieve Arts, a theatre and education company based in the south London borough of Lewisham, offers to primary schools. Called "Giant Tours," The ambiguity of the title is a source of humour--is it a very big tour or a tour inside a giant? The half-day workshop aims to help children in years 2 to 5 (ages 6-10) become more aware of body systems such as digestion, circulation, and the immune system, together with ways of keeping healthy and issues relating to biomedical science, such as ethics. Davies writes that as such, it goes well beyond the current expectations of primary-age children, and that the workshop can perhaps best be characterised as a creative approach to the teaching of what can be a rather abstract part of the science curriculum in primary schools.