Professor Jeffrey J. Kripal, in his 2011 book "Mutants and Mystics: Science Fiction, Superhero Comics, and the Paranormal", describes the Cerebro of the "X-Men" films as "a futuristic superroom into which Professor Xavier wheels over a bridge in order to don the helmet that would magnify his already extraordinary telepathic powers and project the results onto the skull-like internal walls of the room." In the films "X-Men" and "X2: X-Men United", Cerebro is a device that fills a massive spherical room in the basement of Xavier's School. The helmet interface is similar to the version seen in the comics, although the bulk of Cerebro's machinery is contained in the surrounding walls. While in use, three-dimensional images of the humans whose minds are being scanned by the device appear around the interface bridge. Unlike the comics' version of Cerebro, the film version can detect both human and mutant minds with ease. The unique signature of mutant brainwaves is shown in the first film by the mental images of humans depicted in black and white, while those of mutants show up in red. When Xavier illustrates his connection with every human and mutant mind on Earth in the sequel, "X2", mutants appear in red, and humans in white.