Two outputs; positive movement, negative movement Tolerance slider (controls "dead zone" in middle)   Function: Sort of like a speed sensor, but only for the part of the block's movement along its long axis. The black dot sits in the middle when the block is at rest. When the block is moving, the dot moves to the side opposite of (or matching, maybe makes more sense) the movement vector (of the block itself) along the long axis of it. It should not use the dr