"The regenerated do not go to war, nor engage in strife. They are children of peace who have beat their swords into plowshares and their spears into pruning forks, and know no war."

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For a smart material to be able to send out a more complex signal it needs to be nonlinear. If you hit a tuning fork twice as hard it will ring twice as loud but still at the same frequency. That's a linear response. If you hit a person twice as hard they're unlikely just to shout twice as loud. That property lets you learn more about the person than the tuning fork.

— Neil Gershenfeld