 The mathematical literature on CA does not refrain from describing the Life configurations using the same imaginative vocabulary we used: items are born, live, move around, eat other figures, die, etc. The universe these patterns inhabit may also be described, though, as a collection of individual cells, each of which does not directly depend on what is happening on the macro-scale. And the life on Life can also be described in the simple mathematical language of matrices and discrete sequences. But if one is only told the basic Life rule, one could hardly imagine the complexity it can generate—until one sees it. Life’s reputation among scientists and philosophers arguably comes from its challenging naive intuitions about complexity, pattern formation and reality, persistence, and continuity: as a toy universe we ourselves built, we feel we should know in advance what dynamics are allowed. This has been shown to be impossible, in a mathematically precise sense.