The Secret of the Universe

is that it's non-linear.

We do linear stuff because it's easy, or because it will lead us to the non-linear.

• The man searching for his keys....

• Non-linear systems can be very interesting, and unpredictable.

• Linear thinking may kill us:

  Some people believe that small changes in input lead to small changes in outputs (that's linear thinking). It isn't so, as you know from flour beetles!