The Underground Diaries: A Lifetime Together.

You saw it happening between your grandparents.

Even your parents are going along that way. Not to mention you in-laws.

After, say, 30-45 years of marriage, it can happen that you can't really stand each other anymore. 

The ailments. That unnerving bad habit of his that you didn't manage to change. The growing apart.

That is why, when I see something like this on the tube or anywhere else, I can't help but smile blissfully. 

14 September 2011- Circle Line, London. 

I took a similar picture in Rome, and published it here.