US student creates a real life Portal turret
One student at Penn State University has managed to create a turret modelled on those that protect the Aperture Science laboratories in Portal.
The prototyped turret is able to track moving targets and then shoot them in a manner similar to that of the Aperture turrets firing Nerf pellets instead of real bullets.
The turret was created as a final project for the student's Advanced Mechatronics course. It has a shell on the way to make it look identical to the Portal turrets and it even talks too.
A video of the turret in action is available to watch on YouTube and it is pretty impressive.