Projector out of card box?

Yeah, no joke. I just learned that you can make a projector out of card box and a lens.

In this prototyping session, we were given some lenses, tapes, clips , crayons and a card box to make a projector. While the first idea that came to my mind was, "What?",  Google told me that it's possible.

We covered all the gaps on the edges of the box, and proceeded to cut a hole that was about the shape of a given lens. The lens was then fitted into the hole. Once the phone was placed inside the box and the phone was set to have the most brightless, Voila! we couldn't see a thing.

The trick was to turn off the light. Once we did that, blurry image started to show up. Then, we adjusted the position of the phone, and also added a funnel using tape so that the air can be scattered through the lens. Overall, the projector came out pretty successful (I think).