How to build a simple robotic arm from Lego Mindstorms NXT?

Step 6 Attaching the NXT brick

The NXT brick plays the vital role in Mindstorms NXT robotics, so you have to have it somewhere on the robot (or at least somewhere close). In my case only two brick hold together the NXT brick and the robot's base. It's very practical to have it on the base of the robot, 'cuz that makes the robot much more stable.