Opportunism is a big part of photography – not everything has to be planned down to the last detail. This shot is a case in point, I was making my first coffee of the day and spotted the shadows cast by the bug screens on our windows. I have never noticed this before and I suspect that the effect requires extremely bright sunlight from a certain angle. Two minutes after I had taken this shot the effect was no more.
At first I tried to get a shot of the wall on the left but then noticed the shadows on the toggles. Here there is a bonus because the shadows really help to define the form of the toggles.
Anyway this version of the image is a little small but click on it and the original mesh and the shadows cast on both the toggles and the wall will be obvious.