Amy Sales It's true! And foam is one of those weird, interesting
   things. My mind is exploding with connections. Believe it or
   not, I started to be fasctinated by them while looking at a
   Pumice Stone. It looks like a sponge, feels like a hard sponge
   but no amount of water makes it soak up water... and yet, it's
   got all these little tunnels and caverns in it and then I
   realize: They're BUBBLES that are FROZEN! Frozen bubbles."