Today I tried. 
Again and again. 
To jump over my own shadow. 
Each time I jumped 
it moved first. 
 
So, I tried leaping. 
But my shadow only 
leaped ahead of me. 
And now we were 
doing long jumps. 
 
But it was the headway 
that remained 
completely 
out of reach. 
Bugger.
Herbert Nehrlich
http://www.poemhunter.com/poem/my-shadow-4/