trip up

I imagine it's
relief and dread in one
more or less exhilarating line.
Running up a tightrope strung
from sea level to some imagined
starry peak! Peeked at and glimpsed
by looming blue distance lifelong, taken
half-seriously. Now, gaining elevation
in sure-footed sprint as the ground
gathers dizziness beneath you - well,
further on it might. You're not quite
treetops just yet! Just got started, but
you've been running so many miles
your feet have grown wings. You're
sure to find how far and high
this goes. No longer 
imagining
things.