TED Video of the Week: Olafur Eliasson: Playing with space and light

This week's TED Video of the Week is from Olafur Eliasson, whose talk is entitled "Playing with space and light."  From the TED website:

In the spectacular large-scale projects he's famous for (such as "Waterfalls" in New York harbor), Olafur Eliasson creates art from a palette of space, distance, color and light. This idea-packed talk begins with an experiment in the nature of perception.