The comparison does not solve either mystery. It tells us what kind of explanation to look for.

We may not be able to trace every detail of one reply. We can still understand the machinery that made it possible.

We will begin with one switch that can be on or off, then build upward one layer at a time.

Before we open the machine, there is one short detour. People wanted a thinking machine long before they knew how to build one. Their first attempts reveal the problem that learning from examples was meant to solve.