A torchlight procession marching down your throat.
Give me a kiss, and to that kiss a score;Then to that twenty, add a hundred more:A thousand to that hundred: so kiss on,To make that thousand up a million.Treble that million, and when that is done,Let's kiss afresh, as when we first begun.drawing inspiration from Catullus
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.
I couldn't help but to think back to my classmates at Thomas Jefferson High School in San Antonio. They had the same talent, the same brains, the same dreams as the folks we sat with at Stanford and Harvard. I realized the difference wasn't one of intelligence or drive. The difference was opportunity.