high tide

the barrier was made of sand
piled up on the tallest dune
in a furor of activity
ants queued up in the desert heat
as sand slipped and time seeped
the hourglass flipped, the world changed
the barrier switched, the desert set
and water rose
sometime when the moon is pink
there will be no shore left
and the ants afloat will think
the barrier was made of water
and history will switch mediums