Fine Arts and Art Installation Design Or2 Photochromic Canopy Structure by Christoph Klemmt & Rajat Sodhi Or2 is a single surface roof structure which reacts to sunlight. The polygonal segments of the surface react to ultra-violet light, mapping the position and intensity of solar rays. When in the shade, the segments of Or2 are translucent white. However when hit by sunlight they become coloured, flooding the space below with different hues of light. During the day Or2 becomes a shading device passively controlling the space below it. At night Or2 transforms into an enormous chandelier, disseminating light which has been collected by integrated photovoltaic cells during the day.