The Moves

Move 2

A missing relation

To adjust, when something is missing.

The components are there, but no one can say how they connect. The system works in pieces, and the gap between the pieces is the problem.

• Descartes left one missing. His two substances, thinking mind and extended body, had no account of how either affects the other. The relation became the mind-body problem, and Spinoza, Malebranche and Leibniz each proposed one.
• Newton supplied one. Since Aristotle, earthly and heavenly matter had been different kinds. Newton joined them by one law: the force that pulls the apple down keeps the Moon in its orbit.
• Einstein supplied one. Matter and energy, two separate basics, turned out to be related: E = mc².

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