Answer:
Built of metal or wood to divide. It will make us good neighbors, if you stay on your side. What is it?
What can you easily break but never touch?
Useful term for when you need to start a fire or notice someone with the same shirt as you.
They are two brothers. However much they run, they do not reach each other.
I have one eye, See near and far, I hold the moments you treasure, And the things that make you weep.
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.