The Portus Project employed computer graphics for four separate purposes. Firstly, these tools were used as mechanisms to integrate the diverse spatial data gathered via our research. For example, we combined three-dimensional geophysics with laser scans and excavated sections to understand the development of the Building 5. Secondly, computer graphics provided us with a means for developing interpretations of the excavated data. At the corner of the surviving cistern complex (Building 1) of the Palazzo Imperiale, such simulation has helped us to understand how water may have been moved through the complex. Thirdly, they were applied to formal analysis of the site, for instance in terms of structural analysis, studies of lighting, and assessment of the use of space at the port. Fourthly, still, animated and interactive computer graphics enabled the project to communicate its interpretations widely.