**X**(*x*, *y*) = (*x*) + *r* (*P*(*x*) cos *y* + *B*(*x*) sin *y*)

(*t*) = (cos *t*, sin *t*, sin(*nt*))

Click on a picture to view an mpeg picture of the surface rotating.

Click on the arrow to view an mepg of the warping of the torus of revolution.