Hey Ant, thanks for the teaser.
One explanation may be:
The area of the white lined box that has the gate -- the vertical side of the box on our right may be the corner of the wooden fence. The gate within this box is light because it is open. The fence then turns 90 (maybe more than 90) degrees away from us at that corner and continues in a straight line. The top of this section of the fence may be continuous in height and the bottom varying with the terrain. That dark section you point to may be the result of the fact that their are fewer gaps in the fence to let light through. Either side of the gate is the back side of the sun.
This is my first blush explanation, I'll look some more.
Either way, I think that if the client does not remember, then you should be able to create some "plausible" explanation and go with it.
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Mike McCarty
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