— This paper discusses ongoing research into the development of an original composition portfolio themed on the concept of palimpsests of time and place. The research involves the application of an iterative development methodology to refine creative computer-based techniques for the exploration and navigation of multi-dimensional aural and visual content operating within three-dimensional Cartesian space. Various computational functions for utilising a web browser-based system, oriented around a conceptual n-tier layer model, are being developed and refined. Visualisation computational processes related to images (still and moving) of the same place (such as a building) or other artefact (such as a map) over time utilise both authentic and synthetic content. Auralisation computational processes include authentic and synthetic impulse responses (the acquisition of the acoustic characteristics of particular spatial environments) and convolution reverb (recreating the acoustic reverber...