After I had taken this I saw an image by the photographer Garry Winogrand that prefigured my shot - even in details (such as the lamp globes at lower left substituting for the balloons in Winogrand's picture), you can view the Winogrand photograph here:
Link to: Masters of Photography, Winogrand, Untitled
1950s ("Flip")
"We know too much about how pictures look and should look. And how do you get around making those pictures again and again?"
—Garry Winogrand