Building a Home Made Projector?

So recently I have become interested in how projectors work and built one of those simple iPhone projectors (with the magnifying glass). I found instructions to build a higher quality projector on instructables but I don't understand how it works or how it's build. Can someone explain how this projector works or some other simpler plans for building a projector.

http://m.instructables.com/id/homemade-projector-cornflake-box/

If the link you provided isn't enough of an explanation for you, then you are clearly in over your head.

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