The atrium of the Dunedin Public Art Gallery, once part of a large department store, is a busy space in architectural terms, and to view any artwork located on the Big Wall of the mezzanine floor you must approach obliquely, a glimpse at a time, moving towards the vantage points and angles created by the various balconies, landings and stair-railings. Overhead hangs suspended Neil Dawson’s Cones (2000), a five-part sculpture airily dominating the upper atrium area, while Rebecca Baumann’s Light Interference (Spectral Transmission) (2022), a translucent layer of dichroic film that runs the length of the skylight, continuously transforms the walls and floor of the atrium with washes of spectral colour, depending on what the sun is doing. Within this volatile environment, as if at the foot of a rainbow,…