Question

I have to write a paper comparing two art sculptures.
I have write if it's an open or closed contour but I don't know what that means.

Answer 1

closed contour: like a solid, enclosed mass: soccer ball, or a cube
Open contour; the inside is revealed: like a cutaway, or a klein bottle (Broken Link Removed)

http://www.poam.ws/sculptures/10/images/a.jpg
http://www.everettruessdays.org/images/Sculptured_Chair242x305.jpg