"In this photo taken Thursday, Jan. 24, 2013, in Chicago, brain surgeon Ali Alaraj talks about the first time he viewed the brain using the CAVE2. ""You can walk between the blood vessels,"" said the University of Illinois College of Medicine neurosurgeon. ""You can look at the arteries from below. You can look at the arteries from the side"". CAVE2 is a system of 72 stereoscopic liquid crystal display panels that encircles the viewer 320 degrees and creates a 3D environment that can take you to the bridge of the Starship Enterprise, a flyover of the planet Mars, or through the blood vessels of the brain. (AP Photo/Charles Rex Arbogast)"