"The Street" by Octavio Paz.

it's a long and silent street

I walk in the dark and trip and fall

and get up and step blindly

on the mute stones and dry leaves

and someones behind me is also walking 

if I stop, he stops;

if I run,he runs. I turn around: no one.

Everything is black, there is no exit,

and I turn and turn corners

that always lead to the street

where no one waits for me, no one follows,

where I follow a man who trips

and gets up and says when he sees me:

no one.