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Spotted at Hackaday is a link to a flip top display built entirely from Lego.
The display is programmed by arranging single-unit bricks on a template to either turn on or off a pixel. A set of fingers raise up, the new template slides in, and the fingers are lowered onto the template to set the display dot discs
The article links to youtube videos of the complete display in action and a single pixel mechanism showing the on/off sequence.
There is detailed information on the way it works in this forum posting, which links to further information on Chebyshev's Lambda Mechanism and the Dwell Mechanism used in the construction of the feeder.
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(Score: 2) by Freeman on Monday April 27 2015, @06:32PM
Assuming you can't afford brand new legos, used legos are a great option. My wife got one of the large Harry Potter sets at a flea market for $5. It was missing a few parts, but it was a great deal. Can't get as good of deals from e-bay, but they aren't terribly expensive either.
Joshua 1:9 "Be strong and of a good courage; be not afraid, neither be thou dismayed: for the Lord thy God is with thee"