I love projects that use simple, familiar materials to create surprising and wonderful effects.
And Berthil van Beek's "Rainbow Wave GBC" made of Legos certainly meets that creative standard! (GBC stands for Great Ball Contraption. That specification includes the balls themselves --- they have to be tiny soccer balls or basketballs. A machine built according to the GBC standard can be connected to other GBCs to make large connected displays.)
You can see the Rainbow Wave GBC in action by viewing the video at the top of this post or by following this link.
And if you need additional inspiration to pull out some Legos, click on over to Mr. van Beek's YouTube and Flickr pages to see more of his clever contraptions.
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