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Make a cool self-rotating pendulum
Fiery And Gnarly Witch Ball/Pendulum Double Pendulum Terrarium Pendant
Crystal Quartz Double Pendulum Necklace by WhiteMagickAlchemy.
Double Pendulum and Pentacle Wicca Necklace by FrogsandPrinces
Explore Chaos Theory with an LED Double Pendulum - details here http://makezine.com/projects/double-pendulum-2/
Devices that demonstrate true chaotic behavior (in a strict mathematical sense) are rare. Even rarer are chaotic devices that are easy enough for the typic