Homemade Frankenturret by Daniel / Corroder666
The thankfully short-lived Wheatley Laboratories produced many scientific abominations. The Frankenturret, a wretched mashed-together hybrid of the Aperture Science Sentry Turret and the Weighted Storage Cube, was only ever capable of pathetically hopping if placed upright and were quickly discontinued after their creator, Wheatley, was ported into space. DA user Corroder666 made one from scratch, however, complete with glow-y eyes and twitching legs. His goal was to have them walk on their own, but much like the real things, they proved totally inept at even the simplest science. You can read more info about the build (in german) at here, or check out the video below to see it in testing mode:
Artist: Deviantart