(A correspondent has provided me with the following link for a quick, helpful look at an implementation of the Catmull-Clark subdivision algorithm):
The ECPI* blog informs us:
“Software development can be a rather long, tedious procedure. And for some professional software developers, the best way to blow off steam is to leave little “Easter eggs” in their software. Generally speaking, an Easter egg is a hidden message, joke, or feature that is not documented, and often not even meant to be found by the casual user.” It goes on to list “5 of the best, littlest known Easter eggs in computer software”.
*East Coast Polytechnic Institute