How To Create Your Own Multitouch Trackpad for under $20

(all credit goes to Seth Sandler for this concept)

Okay so you want to make your own $20 track pad. 

You will need:

A cardboard box (Any size will do. The bigger the box the bigger the trackpad.), a piece of glass (acrylic, plexiglass, just as long as it's see through), a web cam, and a piece of paper.

How to make it:

Take the box and cut a hole in the side to where the camera cord will go. Insert the usb cord through the box to the outside of the box leaving the camera inside the box. Mount the camera face up directly in the center of the box with some tape. Put the glass on top of the box, and then the paper to cover up the glass. The camera detects the shadow your fingers make when you touch the paper. Download the software you need here. Follow the guide included and you will be set. Enjoy you're multitouch trackpad.