Rober used two iPads, one in the front and one in the back, and had them FaceTime each other to make it appear as though you could see completely through his body in real time.
The pretend hole in his body opened up everyone's eyes to the real hole in the market for amazing high-tech costumes. After everyone fell in love with Rober's creation, he came up with his own company, Digital Dudz, which he just sold to a British company called Morph Suits. They created a whole line of T-shirts and a free app allowing people to match up the shirt with the proper video on their phone, which slips into an inside pocket, making an easy yet horrifying costume, like the crowd-pleasing twitching eyeball held open with safety pins:
Simple, yet eye-catching.
There's also the creepy clown shirt with the accompanying realistic eyeball animation: