This is a robot that Roy made.  It does one thing, it just doesn't fall off a table.

Here is another one of Roy's robots.  This is the bricklayer robot.

Tal made this robot.  This is a Legway, based on James Matthews' design.  A Legway is like a Segway, but made with Lego Mindstorms.  It is a robot that balances itself even though it has only two wheels.