Yesterday I was again in an apartment where two cats live. These apartment cats never get out to walk the streets. If the apartment has a balcony they may get out there, but most cats see the world, by window sill. A friend once made the following observation: the City is full of dogs, we see them being walked all the time. But the cats, we never see. I bet, he continued, that there are twice as many cats at least in the City as dogs, the hidden pets. So I think about that. Imagine that on a given day all the hidden cats came to the windows of the places they live. I think we would be astounded at the number.