A centrepiece of the movie is Adrian's use of invisibility to commit violent actions (murder, etc.) and make it look as though Cecilia did it. Moreover he makes others and Cecilia herself question Cecilia's sanity (gaslighting). The invisibility suit functions by being covered by thousands of small cameras/LEDs. In effect, the invisibility is a function of manipulated vision. The cameras are motorized, shown when the suit powers down, and the panels with the cameras seem to take in and project light/picture, to create the illusion of invisibility. This is supported by the fact that the body in the suit has no shadow.