“October 15 2003: The Weather Project by Olafur Eliasson (October 2003-March 2004). Visitors flocked to the Danish artist’s representation of the sun, achieved by combining hundreds of mono-frequency lamps in a semicircle, mirrored to produce a radiant sphere” 
“In this installation, The Weather Project, representations of
the sun and sky dominate the expanse of the Turbine Hall. A fine mist permeates the space, as if creeping in from the environment outside. Throughout the day, the mist accumulates into faint, cloud-like formations, before dissipating across the space. A glance overhead, to
see where the mist might escape, reveals that the ceiling of the Turbine Hall has disappeared, replaced by a reflection of the space below. At the far end of the hall is a giant semi-circular form made up of hundreds of mono-frequency lamps. The arc repeated in the mirror overhead produces a sphere of dazzling radiance linking the real space with the reflection. Generally used in street lighting, mono-frequency lamps emit light at such a narrow frequency that colours other than yellow and black are invisible, thus transforming the visual field around the sun into a vast duotone landscape.” 
Taken in the Tate Modern in Autumn 2003. A huge light structure with a mirrored ceiling. The colours are untouched and as they were on the day. The indoor sun exhibit at the Tate Moderne museum in London.