Level 4 is an exploration of an exhibition, which was shown at the Baltic several years ago. The exhibition showed an empty lorry a direct copy of one that used to contain a whale called Jonah. Taking this as a starting point I spent three days in the exhibition space gathering information and material as to how audiences interact with the space, the objects and how in turn galleries are presenting work. The book deals with ideas of memory, particularly of collective memory, and how that informs our interpretations of artwork. The book contains photographs, texts and diagrams.