-solid object or as a set of see-through bands. Finally, the colors
-with with the torus is drawn can be set to either two-sided or to a
-color wheel. In the first case, the torus is drawn with red on the
-outside and green on the inside. This mode enables you to see that
-the torus turns inside-out as it rotates in 4d. The second mode draws
-the torus with a fully saturated color wheel. This gives a very nice
-effect when combined with the see-through bands mode. The rotation
-speed for each of the six planes around which the torus rotates can be
-chosen. This program is very much inspired by Thomas Banchoff's book
-"Beyond the Third Dimension: Geometry, Computer Graphics, and Higher
-Dimensions", Scientific American Library, 1990.
+solid object or as a set of see-through bands or see-through spirals.
+Finally, the colors with with the torus is drawn can be set to either
+two-sided or to a color wheel. In the first case, the torus is drawn
+with red on the outside and green on the inside. This mode enables
+you to see that the torus turns inside-out as it rotates in 4d. The
+second mode draws the torus with a fully saturated color wheel. This
+gives a very nice effect when combined with the see-through bands or
+see-through spirals mode. The rotation speed for each of the six
+planes around which the torus rotates can be chosen. This program is
+very much inspired by Thomas Banchoff's book "Beyond the Third
+Dimension: Geometry, Computer Graphics, and Higher Dimensions",
+Scientific American Library, 1990.