All of this is just a reflection on a wall.
In the Tate Modern Museum there is a place to sit and look at a nice view of St. Paul's Cathedral. Here's a warning: turn right, NOT left, when you exit the elevator or you just might walk into this wall. Sorry, that's me kneeling in the bottom right side of the picture.
I hope you have a good Memorial Day weekend!
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A Reflection = An image given back by a reflecting surface.