There You Are
“On September 13th, 2012, Valve received another mysterious crate from WETA Workshop. Inside was a full-scale, articulated Portal turret, complete with a motion sensor. Once again, WETA Workshop’s gone far, far beyond our expectations to deliver something truly amazing. Thank you, WETA Workshop!”
Portal: Terminal Velocity
“My interpretation of what a real Portal gun would be like if one existed.”
coolcoolcool.
Real Tracking and Shooting Portal Turret
“The robot is the skeleton of a turret from the game Portal that uses an IP webcam to track a target and fire nerf bullets at them.”
Amazing Portal Cake
This awesome cake was designed by this blogger, and I found it on Nerdalicious.
‘Ridiculous Minigolf: Crazy golf holes inspired by Portal, Minecraft, the Crystal Maze, and more’

Portal Test Subject Converse Shoes
Source: Unknown. If you know the source, let me know so I can credit accordingly.