@C0@lHere is a segment which lies along the y 

@C0@ldirection, so it looks like a point in the 

@C0@lX_W_plane.  Notice how the motion of the

@C0@lsegment is similar to the motion of the

@C0@lpoint.

@C0@l

@C0@lThis is the first step in the progression to

@C0@lthe four dimensional analogue of a cube.  A

@C0@lsegment is "one-dimensional" , and is the

@C0@lresult of connecting two points.

@C0@l

@C4@lPress "2 segments" to continue.

