Olafur Eliasson’s colorful glass tunnel comes to life when you stroll through it one way, but if you look back over your shoulder, the panels appear black. The mesmerizing, kaleidoscope-like tunnel is comprised of stained glass triangles held together with bold, black piping. When viewed from one end, the tunnel is a rainbow of purple, pink and yellow, but the interesting one-way effect masks the colors from the other side.The Icelandic artist is known for engaging viewers in nontraditional ways by inviting them to interact with his artwork. He is known to incorporate air temperature, moisture, smells, light and walkways into his pieces to help guests more fully experience his work. In keeping with this theme, the San Francisco Museum of Modern Art billed the one-way tunnel as “intentionally simple in construction but thrilling to behold, sparking profound, visceral reactions designed to heighten one’s experience of the everyday.”