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benice
Posts:
6
Registered:
1/17/11


Hint
Posted:
Feb 6, 2011 3:25 PM


Consider the intersection of a horizontal plane with the surface.
The intersection consists of a family of funny curves. (An example curve is shown below. It has nothing to do with the answer.)
Cut off the upper surface above the horizontal plane to get a funny 3D image.
Example curve: http://i1216.photobucket.com/albums/dd371/benice_chen/bad_bunny_400x400.png (This curve is obtained from another surface.)



