> Sometimes I am very small  
> But sometimes even tall  
> My name is sometimes spoken with a humans name  
> but I am not an human at all  
> you can throw me but not If I am too heavy  
> And even if I'm very light I cannot walk away  
> Once I was a part of a union  
> But now I am a one-man-Army seeking for a revolution  
> I was cut and separated from my Family  
> But you can pick your family and climb on me  

I hope this not too heavy for you ;)

EDIT: I think now it's a little bit easier and more precise ;)