Chloroplasts bear chlorophyll; they give the green world its color, and they carry out the business of photosynthesis. Around the inside perimeter of each gigantic cell trailed a continuous loop of these bright green dots. They spun . . . they pulsed, pressed, and thronged . . . they shone, they swarmed in ever-shifting files around and around the edge of the cell; they wandered, they charged, they milled, raced . . . they flowed and trooped greenly . . . All the green in the planted world consists of these whole, rounded chloroplasts . . . If you analyze a molecule of chlorophyll itself, what you get is one hundred thirty-six atoms of hydrogen, carbon, oxygen, and nitrogen arranged in an exact and complex relationship around a central ring. At the ring’s center is a single atom of magnesium. Now: If you remove the atom of magnesium and in its place put an atom of iron, you get a molecule of hemoglobin. The iron atom combines with all the other atoms to make red blood, the streaming red dots in the goldfish’s tail.

What have we been doing all these centuries but trying to call God back to the mountain, or, failing that, raise a peep out of anything that isn't us? What is the difference between a cathedral and a physics lab? Are not they both saying: Hello? We spy on whales and on interstellar radio objects; we starve ourselves and pray till we're blue.

Many writers do little else but sit in small rooms recalling the real world.

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"A work in progress quickly becomes feral. It reverts to a wild state overnight. It is barely domesticated, a mustang on which you one day fastened a halter, but which now you cannot catch. It is a lion you cage in your study. As the work grows, it gets harder to control; it is a lion growing in strength. You must visit it every day and reassert your mastery over it. If you skip a day, you are, quite rightly, afraid to open the door to its room. You enter its room with bravura, holding a chair at the thing and shouting, "Simba!

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I cannot cause light; the most I can do is try to put myself in the path of its beam. It is possible, in deep space, to sail on solar wind. Light, be it particle or wave, has force: you can rig a giant sail and go. The secret of seeing is to sail on solar wind. Hone and spread your spirit till you yourself are a sail, whetted, translucent, broadside to the merest puff

"You can, in short, lead the life of the mind, which is, despite some appalling frustrations, the happiest life on earth. And one day, in the thick of this, approaching some partial vision, you will (I swear) find yourself on the receiving end of - of all things - an "idea for a story," and you will, God save you, start thinking about writing some fiction of your own. Then you will understand, in what I fancy might be a blinding flash, that all this passionate thinking is what fiction is about, that all those other fiction writers started as you did, and are laborers in the same vineyard."

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The universe that suckled us is a monster that does not care if we live or die — it does not care if it itself grinds to a halt. It is a beast running on chance and death, careening from nowhere to nowhere. It is fixed and blind, a robot programmed to kill. We are free and seeing; we can only try to outwit it at every turn to save our lives.

There was only silence. It was the silence of matter caught in the act and embarrassed. There were no cells moving, and yet there were cells. I could see the shape of the land, how it lay holding silence. Its poise and its stillness were unendurable, like the ring of the silence you hear in your skull when you're little and notice you're living the ring which resumes later in life when you're sick.