Shadows cast

From the workroom a group of us noticed strange grey lines in the sky. It took us a few moments to work out that they were the shadows of aeroplane trails across the sky. The trails were just above the clouds and with the sun peeping through, they temporarily cast thick grey lines.

I had left my 'good' camera in the boot of the car so had to make do with a camera phone, even worse I didn't even open the window, too distracted by trying to capture the shadows before the clouds moved!