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That light plays a crucial role in our sensation of space has been recognised for centuries. Gothic cathedrals are shrines of light and the Baroque produced some of the most dramatic as well as subtle sculpting of surfaces to direct light. This is not simply a matter of letting in sunlight; it is a question as to which surfaces are lit and reflect back light. Louis Kahn phrased it poetically as ‘the sun never knew how great it was until it struck the side of a building’ (Johnson, 1975, p.12).