I think it is a good example because it is fundamentally different than a sponge. Spaghetti have air pockets moving in just one dimension, in a linear fashion,

I think it is a good example because it is fundamentally different than a sponge. Spaghetti have air pockets moving in just one dimension, in a linear fashion, and of the same size; whereas a sponge has multisize 3d air pockets.