@C0@lHere is the tesseract.  It should look like 

@C0@ltwo cubes connected at the vertices, each cube 

@C0@lrotating in a by now familiar way.  If 

@C0@lit makes sense, congratulations, the rest

@C0@lof this demo is just icing.

@C0@l

@C0@lOne variation is to do this whole progression 

@C0@lagain, but with a slightly tilted tesseract.

@C0@l

@C4@lUsing the LEFT mouse button, tilt the 

@C4@ltesseract slightly in the X_W_plane (not

@C4@lthe X_Y_Z_hyperplane).  

@C0@l

@C0@lNow try the progression from a single point 

@C0@lto the segment and so on.  This should illustrate

@C0@lwhat's going on when we move to more general

@C0@lrotations.

@C0@l

@C4@lIf you would like to see some of the

@C4@lother constituent parts of the tesseract

@C4@lby themselves, try the "Expert" panel,

@C4@lwhich you get by pressing the button

@C4@llabelled "Expert".

@C0@l

@C0@lThis concludes the explanatory text for

@C0@lthis demo.  If you have any comments, 

@C0@lplease email them to holt@geom.umn.edu

@C0@lThank you.

