CrystalCross, it doesnt appear that it is taken through a window.. if so .. its the cleanest window I've ever seen ( maybe thats just my thinking.. since I have little ones who put their fingers all over everything )

The only explanation I can come up with is that of maybe the light distorting through out the trees, or reflecting off of glass behind the photographer... but thats about it.. and those are just shots in the dark, as I have no idea, if photos were taken before/after were random of it could just be unexplained.