Answer:
What can't you see, hear or feel, until its too late. What shadows love, and shopkeepers hate?
I can travel from there to here by disappearing, and here to there by reappearing.
A caribbean shape that makes ships disappear
The sharp slim blade, that cuts the wind.
A beggar's brother went out to sea and drowned. But the man who drowned had no brother. Who was the beggar to the man who drowned?
I run through hills. I veer around mountains. I leap over rivers. And crawl through the forests. Step out your door to find me.