The walking eye is a prototype robot constructed in the Big Mountain Research and Development Center in the Magnetohydraulics complex. It is a four-legged, spider-like robot similar to the Chinesespider drone with a white spherical body containing a graduated eye inside. They are used for espionage and surveillance, and to this end they can climb walls and hang from ceilings for seemingly indefinite periods of time. In 2281, there are still four functional walking eyes remaining in Big MT, all stuck in the Magnetohydraulics complex.
They cannot be targeted in V.A.T.S., destroyed, searched or moved.
Walking eyes are a reference to an episode of The Venture Bros. entitled Fallen Arches, where Dr. Venture uses his prototype walking eye as a lure to attract the attention of supervillains, and is apparently quite proud of it as he employs it in later episodes. This robot is, in turn, a parody of the walking eye robots in the Jonny Quest cartoon series.