@C0@lThis square extends in the y and z directions only,

@C0@lso it still looks like a point in the x,w plane.

@C0@lThe square can be looked at as two segments, joined at

@C0@lthe ends.  

@C0@l

@C0@lYou can look at these two segments 

@C0@lindividually, by going back to "2 segments".

@C0@l

@C0@lUp till now, the rotations we've been seeing

@C0@llook sort of like normal rotations,

@C0@lwith the object viewed edge on.  For example,

@C0@lif we imagine a planet orbiting the sun

@C0@land we look at it from the side (not from

@C0@labove), from very far away,

@C0@lthe planet may look like its just going

@C0@lback and forth along a line.  But with the

@C0@lsquare, we can no longer understand its

@C0@lmotion as a normal 3d rotation seen through

@C0@la peculiar lens. That is, the square extends

@C0@lin the y and z directions, and its rotation

@C0@linvolves the x and w directions, so the

@C0@lanimation seen in the X_Y_Z_hyperplane

@C0@lis not simply a 3D rotation viewed from

@C0@la particular angle.

@C0@l

@C4@lPress "2 squares" to continue.

