[ATM] binocular views

[charlesmitchard at iinet.net.au (Charles Mitchard)]

greetings all,
the other day I used a couple of pairs of standard binoculars for
terrestrial viewing. (first time ever)
The view was from a mountain top looking down the valley with lots of trees
in the foreground.
The trees were circular in shape but through the binoculars they looked as
if they had been pressed flat and arranged in layers (almost like those old
pop-up-books)
It looked like all the close trees were on different layers at different 
distances, I found it quite interesting trying to perceive the correct 
shape of the trees.
Is this a normal illusion in these instances?
Thanks
Charles
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