Monument explores memory, death, history, heroism, representation and time. Its subject is taken from a series of Victorian ceramic tiles photographed by Hiller in a London park. These commemorate acts of courage by ordinary men, women and children. Hiller's greatly enlarged photographs draw attention to changes wrought by time and have a powerful formal presence. The sound track, which the viewer should listen to after looking at the photographs, is crucial to an understanding of work; it makes the viewer/listener an active participant and an integral part of the installation when seen by other spectators. Hiller pioneered installation in the early 1980s. The combination here of sound and image was innovatory.