Tacita Dean, Installation Views, The Green Ray, 2001, color film, 16MM, silent, 2 1/2 minutes.
"In America they call it the green flash. When the sun sets, in a very clear horizon, with no land mass for many hundreds of miles, and no moisture or atmospheric pressure, you have a good chance of seeing it. The slowest ray is the blue ray, which comes across as green when the sun sets in perfect atmospheric conditions. It’s the last ray as the sun recedes with the curvature of the earth. Like a pulse on the horizon. It’s totally fractional, though it can last longer."