Callum's work is primarily concerned with geographic experience and the transpositions of media upon that knowledge. Using multiple images within the borders of a single work, the visual experience is reconstructed through the process of drawing and digital media, which create new surreal environments. Through the act of painting, the visual image is no longer an accurate rendering of the actual world but a collaboration of processes. Callum explains that his interest lies in the disjointed construction that memory creates through the influence of fleeting visions of land.