rains falls, grim and grey
the park is empty–
soaked mud leaks in streams
across sidewalks like
pulsating coffee veins.
but at one hoop
the wet thuds of diminished dribbles
a small boy shoots
his watery reflection in the inverted world
following his every move.
the sieve and the sand 
“Pulsating coffee veins” and “inverted world following his every move” are fan-freakin-tastic!
‘pulsating coffee veins’ is my pick too! the metaphor really evokes the soft, insidious channeling of storm water, dirty and slowly creeping under mats and inside shoes. nice work
i also enjoyed, “in the inverted world following his every move.” that is cool.