[Boxed] Multiple bouncing balls in a box are a metaphor for community. Notice how the escaping balls explode. This is what happens to people who move from Perl to Ruby.
Once you have been in an earthquake you know, even if you survive without a scratch, that like a stroke in the heart, it remains in the earth's breast, horribly potential, always promising to return, to hit you again, with an even more devastating force.