“At this moment, in this place, the shifting action potential in my neurons cascade into certain arrangements, patterns, thoughts; they flow down my spine, branch into my arms, my fingers, until muscles twitch and thought is translated into motion; mechanical levers are pressed; electrons are rearranged; marks are made on paper.At another time, in another place, light strikes the marks, reflects into a pair of high-precision optical instruments sculpted by nature after billions of years of random mutations; upside-down images are formed against two screens made up of millions of light-sensitive cells, which translate light into electrical pulses that go up the optic nerves, cross the chiasm, down the optic tracts, and into the visual cortex, where the pulses are reassembled into letters, punctuation marks, words, sentences, vehicles, tenors, thoughts.The entire system seems fragile, preposterous, science fictional.”