Lines are fascinating creatures of space because they determine

in and out    /    top and bottom    /    left, center, right

also the boundaries between:

me and you    /   you and another    /   another and the other    /    the other and others

they viciously and maliciously:

cut          divide         limit           exclude 

but we dare not bear grudge,  for they work so industriously to keep us connected from:

Oxford-------------------------to New York.