The mushrooms are made of builder's foam sprayed over large pilates balls and the tubes in the middle of carpet rolls. 'The mushrooms have brought together three worlds for me: that of a child and his/her imagination, mushrooms clouds/war/conflict and as psychoactive drugs.' Nagel. They help to indicate the route of a Dulwich Outdoor Gallery walk, beginning in East Dulwich and ending in Dulwich Picture Gallery. Some have now gone.