What am I?

How, when the ground’s gone from under one’s feet,

find a fixed point from which to start again?

I am not falling.  Falling implies gravity

and something there below at the fall’s end.

I am (so far as I am) rather floating.

Nothing for foot to press on or hand feel

to tell me I can count myself a substance still.

Am I just my dream, in daylight dissipating?