Contrails.

Was greeted thus morning with wonderful blue skies and no wind, perfect tennis weather. A twinge in my knee meant that I was less mobile than usual (not quite static, but close).

There seemed to be loads of aeroplanes raking off and coming into land at Manchester, and their contrails cut across the sky wherever you looked at it. I chose this blip from the selection I took as the planes seemed to be weaving a pattern at 90 degrees to one another.