“I can observe how a crack grows by studying cracks within a rock outcrop from thinnest to widest. Like a foot in the door, wind-blown dust drops into these cracks and prevents them from closing. A dusty crack retains more moisture than a bare crack, so when the moisture freezes in winter, the dusty crack […]
“We live within gradients. A gradient of thinning atmosphere intervenes between my lungs and the vacuum of outer space. Just as a gradient of vibrations along the web can guide the spider to the struggling fly, so a gradient of increasingly wider, busier roads can guide me from my driveway to the nearest highway. … […]
“One evening I saw the Earth turning. Before that night, I had always seen the sun setting toward a stationary horizon. But when I saw the sun ,instead, as stationary, then I saw my horizon rising toward the sun … My mind must make an assumption. Shifting that assumption changes the world I see. … […]
