Troika’s SMS Projector

I like the cool hunting videos. In one of their recent videos, they showed Troika’s SMS projector. I postulate that they have a phone in there and they took the lcd screen off and put it in just the right place so that it would be in the same place as film if it were a camera, then they have a halogen light behind it and the light shines through the lcd, through the long camera lens and onto unsuspecting people’s backs. How would you make it? – Link