The logo on the CCCG web page is an origami crease pattern. If you fold it flat, all bold lines outlining the letters line up. Making one complete straight cut along the bold line and unfolding the pieces results in a piece of paper with holes spelling CCCG as well as three copies of C and one copy of G.
The construction of this CCCG logo is described in the paper:
The CCCG 2001 Logo
Erik D. Demaine, Martin L. Demaine, Anna Lubiw
Proceedings of CCCG 2001, pp. iv-v, 2001
Last updated Sun Aug 18 14:00:34 EDT 2002 by Pat Morin