I argue that naturalistic pictures provide a guide and a justification for our concept of colour. The crucial relation between pictures and colours is to be brought out, not by reference to the ‘internal’ relations between colours (for example, what differentiates green from red), but by considering how colours are differentiated from the wider range of visually discriminable qualities. Naturalistic pictures effect such a differentiation by simulating colour-like qualities such as gold, amber, and blond, while requiring nothing beyond the three-dimensional (...) manifold of colour space. The seeming simplicity and salience of colour in our visual experience should be recognized as depending on our familiarity with this reductive power of naturalistic pictures. While some sense of these issues has been given expression by many thinkers, the idea is significantly articulated in remarks of Wittgenstein's that were prompted by his reading of a letter the painter Runge wrote to Goethe. (shrink)

Traditional navigation visualization utilizes two-dimensional. maps for road guidance or arrow symbols for turn by turn information. While the advantage of map views is supposed to be the inherent understanding of the surroundings, often these schematic line-drawing bird's eye views are rather confusing than helpful because they cannot provide an overview and an appropriate level of detail in an area of interest at the same time, i.e. the user is forced to change between different resolutions. In this paper we describe (...) a 3D visualization system for vehicle navigation that overcomes these shortcomings by providing a realistic and perspective 3D view of the environment. (shrink)