This paper discusses the problems of visualizing colour appearance in an interactive virtual environment (VE) from the viewpoint of practice based architectural research. The discussion is based upon the research information project Virtual Colour Laboratory (VCL), the aim of which is to visually present and demonstrate existing research results on spatial colour phenomena for educational purposes, in the shape of a software application. During the work on this project, various problems connected to the visualization of colour appearance have emerged which are discussed in relation to current research on spatial experience and visual appearance in VEs. The aim of the paper is to focus on the importance of colour appearance in digital modelling as well as to highlight the problems of visualizing colour appearance interactively. The term colour appearance is used here as a general concept for the perceived colour of a surface or object.
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