You Will Leave (excerpt)

This is an excerpt from a short story, You Will Leave, that may appear in an upcoming book I'm working on, tentatively titled Situations of I.  

Sorry I haven't been here lately.  Busy.  

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A boy finds a bottle on a beach.  The surf washes its cadence into the shore and interacts with itself, grinding shells and flotsam in eternal repetitive movements.

A bottle.  An empty Pepsi bottle.  He picks it up from the sand.  Contentment flows through him.  He squats and sets the bottle upright on the damp sand just beyond the waterline.  A handful of sand, held over the lid, lets granules sift onto the rounded top and cascade down the sides in a musical shushing hollow sound.

First sand fills the bottle, then is poured out to form a pile.  Again..  Again..  The pile grows. 

Later, small shells alone fill the bottom portion of the plastic cylindrical container.

The boy holds one hand on top of the bottle and shakes it.  This, and the resulting sound, go on for some time.