This was a project I did for my Arduino prototyping class where the assignment was to make an object for an imaginary science fair attracting "as much attention as you can muster", like something Phineas and Ferb would make. 

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I created a shoebox diorama with a rotating tornado (made from the 5V fan + blade attachment plus some electrical tape and strips of a tissue) and LEDs to demonstrate the cold and hot air swirling around, plus some fun construction paper decorations in the background.