Source: http://lifehacker.com/5863761/build-a-smartphone-projector-for-around-a-dollar
Using a magnifying glass, a shoebox, tape, and LEGOs, you can set your phone inside the box, seal it up, and watch as it's displayed on your wall. The image flips when it goes through the magnifying glass, so you'll need to make sure you lock the rotation on your phone if it has an accelerometer. It won't work for movies with subtitles, as the words will be flipped backwards and you're not going to get the same high quality image you get with a store bought projector, but it's cheap alternative for those looking to watch a few movies.
How to make a projector for your iPod/iPhone for about a $1 | Instructables
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