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There's so much tension in this photo--I'm getting the same feeling in my stomach as when I stand close to a cliff. Here, I'm waiting for the ball to either fall off the edge of the building or miraculously roll up the incline and down into the safety of the roof-top valley on the right. And I like how that patch of white in the upper right balances out the dark ball--I love your choice of cropping here, and the way you've selected a viewpoint that juxtaposes the geometrical elements into a kind of a narrative.