In the San Francisco Museum of Art, there's a tunnel made of glass. (But it's not just ANY tunnel.) Walking through it is somewhat like being inside a kaleidoscope, with shards of color sparkling all around you. Olafur Eliasson Olafur Eliasson (via My Modern Met) Olafur Eliasson However, if you look back, you might find that the color has suddenly vanished, leaving you in a suddenly much-more ominous all-black tunnel. The jewel-like facets now take on an alien look in slick black. Where are you? Olafur Eliasson Olafur Eliasson The One Way Color Tunnel is a 2007 installation piece by...