“Superposition - of Three Types” was a 2017 exhibition at Artspace, Sydney, curated by Alexie Glass-Kantor and Talia Linz. It featured thirteen Australian artists who work within colour abstraction across the disciplines of painting, sculpture, installation, text, movement and sound; the artists included Jonny Niesche, Shelley Lasica, Brendan Van Hek and Rebecca Baumann.

Julian Day's contribution was a collaboration with writer and curator Macushla Robinson. It comprised a mobile audio guide that offered oblique, poetic reflections on the works in the exhibition. The tracks were randomized so that the artworks were perceived through unintended frames: no two journeys were identical. The inspiration was a malfunctioning audio guide at a leading international museum, which created unexpected and unusual juxtapositions such as reading a minimalist sculpture through the text for an abstract expressionist painting.

Each track featured a text by Day and/or Robinson, with or without additional audio content such as excerpts of sound works by Day, contemporary composers like Austin Buckett or historical composers such as Beethoven. The texts were a mixture of guided meditation, art historical and musicological information or audience direction, spoken in Day's low and rich bass voice honed from years spent in classical radio.