First off, I'd advise you to rotate the camera up and to the right so you're looking
more down and at an angle.
Then press the "GO" button. A block will move from the origin, (0,0,0), to the point
(5,4,3). The speed on the block is uniform. As it does this "shadow" blocks move
along the x, y, and zaxes, keeping aligned with the main block. The speeds
of the shadow blocks are less than that of the main block, but the 3 components
of the velocity vector of the main block are just the 3 speeds of the shadow
blocks. The speed of the main block (a nonnegative scalar) is the square root
of the sum of the squares of its components.
