temperature tutorial

Lake cold is bluer than veins
snaking up ankles, hoping brain
will hop back to beach hot 
and leave the body surfing to braver souls
with seal thick skins.

There's no boards or language for it,
Great Lake breakers
only waist high, chest cold,
jump just right, swell feeling the sand bar
on belly and loose trunks balloon with water
and flap flag flat like so much
mis-named seaweed.

The shiver delicious in summer,
numb and colored lips smiling in towels
too thin, jawbone creaking as if the ice
set in, and way out in the waves,
without a chance of toe tip on the bottom
Pa swims arm over arm as if last night's stars

could follow him against the tide.