I (used to) have an office right next to this place where I am standing, and I am a bit fascinated by high points of view. When it started raining I went there to photograph umbrellas from the top. I shot tens of them, and this one just heppened to pass by. I was there at the right time, at the right place. Got lucky. But just like Henry Cartier Bresson (my guru) always said: "Photography has a lot to do with luck". I agree.