Weird Shaped Things.

So I have these weird shaped treese in my front yard. They are beautiful trees don't get me wrong. And who could resiest those colors. What I am woundering is how did they get to be that shape. I mean come on you just don't see tree's in everyday life that look pointed on top,or at least I don't. Those tree's have been in my yard well now my parents yard for a very long time. They are very beautiful shade tree's and everytime I come home for the holidays I like to sit under them and just relax,providing that's it's not cold and windy out side. All I can say is that I love those tree's,and there beautiful color's.