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Square tube rotating 180 degree around figure 8 curve. Can be customized in a variety of ways

Umbilic Torus.  A ball will roll around the three sides and return to start point.  Can be done to most knot curves with different number of sides.  PM me for a custom creation.  Animation of rolling ball at: http://www.youtube.com/watch?v=SkBijZfdK3w

Pentagonal tube rotate 8Pi/5 around solomon seal knot curve.

Square tube rotating -90 Degrees around a 8,19 torus knot

Pentagonal tube rotating around 5,2 knot curve.

Square tube rotating 270 Degree around 6-2 knot curve.

Square tube rotating 32 time around 6-1 knot curve