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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 t-3 on Sunday April 26 2015, @07:05PM
I would imagine this would just be a modified water clock, most likely would look totally awesome and probably fetch a nice price if you made it aesthetically pleasing and marketed it as alternative art with some appropriately vague symbolic meaning.