Popup your ideas upon the wall.
The Metamorphosis Installation by Alex Andre is a circular portal with a spinning semi-reflective disk through which participants face each other to create ever-changing combinations or self images in real time.
When Coke encounters Mentos.
A mini submarine called OpenROV: an open-source, battery-powered underwater robot. OpenROV is designed to facilitate amateur needs of underwater exploration, with almost omnipotent reaching capability. Its applications includes underwater detection, search and rescue and education.
Make Faire perhaps also exhibits a collection of all sorts of wild and bizarre wheeled things you could imagine. A seafood skinned car, fish and lobster singing happily when traveling.
Four wheeled "carriage."
USS “Nautilus” with diesel engines.
Huge metal tree.