There is a bridge in Karachi that my grandfather built 50 years ago. I've been driving over it for the last seven and it's only recently that I found out. He never mentioned it and I never bothered to ask. But whenever I drive over it now, I feel a sense of possession, as if it's my bridge. Something that links me to him. Is that where the roots of patriotism lie? An attempt to preserve the memories of the people we love?