This is a cardboard machine I made that break down into two parts. The first bit is completely mechanical and is powered by a hand crank hooked up to a worm drive. That is attached to a ratchet that rotates a wheel with ten panels attached to the bottom. At every rotation, a panel pops down, revealing a picture or a message. The second part is hidden in the false bottom of the box. Pulling on a string reveals a hand-held Arduino controlled information device. The device has an LCD that plays through some words, and a conveyor belt display that's controlled by a photoresistor.