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The above video shows B-Squares, an awesome project from Jordan McRae. B-Square is a modular electronics system that makes playing around with electronics a snap. Each square has magnetic corners with positive or negative connections, so hooking up two (or however many) squares is as simple as pushing them together.
There are then different squares, each with a unique function. The solar-square acts as a small solar panel. The battery-square has three rechargeable internal AAA batteries. The Arduino-Square has the functionality of an Arduino Pro and the iPhone-square allows you to connect an iPhone. There is also a speaker-square (to, ya know, use a speaker) and a Proto-Square that lets you design your own B-Square.
The entire system is very well designed and has tons of potential. It's awesome to see how easy it is to connect a few squares together and create an instant circuit. Check out Jordan's KickStarter page for more information on this project. Awesome work!