DP Challenge: Lakeside Contemplation

Knick knelt next to the lakeshore, then sat back on the slab of limestone.  It was cold, sucking the heat from him, and it felt as if it could absorb every last bit that his body would give up, if he allowed himself to sit there long enough.

The breeze was light, almost imperceptible, but still there was a slight chop on the water, advancing toward him from the other side, straight down the long axis of the lake.  He knew the lake was about 4 or 5 miles long in that direction, and he considered the time it took the air brushing his face to traverse that open water.  Did the air give its heat to the water over that span, or was it warmed by the water?  The water was calm but for that slight chop, and as he looked across the water he thought of those dioramas you could buy at the museum gift shop, the type that are built with colored oil and water to highlight the fluidity of immiscible interfaces, in that case incompatible liquids.  Here, he was in the diorama, a part of the display on the edge of the gas/liquid phase interface, and the water waves were being driven to him by an unseeable but no less substantial light breeze.  He had to focus to visualize it, but he recognized that the shape of the air matched and exactly fit the shape of the water’s surface, ripple for ripple, wave for wave.

He tried to note the exact point where the waterline met the shore, and noticed that although the surface of the lake was quite calm, the exact edge of the water was in constant motion.   The air in motion across the water, and the boundary properties of the air and water interface (both materials viscous to some degree), air pushing water like a hand smoothing wrinkles on a bedsheet.  Visualizing a bobber on the water’s edge, just a molecule or two in size, it rose and fell as the tiny waves approached the sand and fine gravel of the shoreline, rising, cresting a miniature crest, and receding.

Then he noticed the motion of the tiny pieces of gravel at the water’s edge, so small they were nearly sand, but by inspection they appeared to be small pieces of rock or zebra mussel shells.  Every few seconds a tiny wave would build, crest, and break, and all along the four-foot stretch of shoreline where he sat, the tiny rocks and shell fragments would roll and tumble.  As each wave built and crested, they’d be borne up, not floating, but riding the ascension of the water volume, and as each tiny wave broke and receded, they would land back on the rest of the aggregate composing the shoreline, and would frantically roll and tumble, drawn down and out by the infinitesimal rip.

The tumble of these particles drew him in and down until he empathized and could conceive to experience their motion.  They tumbled and bounced like boulders, and at the right scale he imagined he would hear the knocking of rock on rock as they rolled back down to be lifted and carried again with the next wave.

All this happened silently to his ear.  It would have been invisible to his eye, as well, had he not sat down here and inspected in such detail, drawn by the fine motion of the water on the shoreline.  But he imagined then the crashing and the pounding sounds, down at the level of these breakers and boulders, water lifting and tossing and crashing, boulders knocking and bouncing and breaking.  This was happening all up and down the shoreline on this side of the lake, a deafening realization as he continued to imagine placing himself at that level.

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