It's Abstract Thursday!

Today's AT theme, set by our regular host Ingeborg, is 'Perspective'.  I haven't really followed the brief at all as I almost forgot to take a photo until I was standing outside the supermarket at 5pm, with only my phone available.  The sky did look rather splendid, although as it's Abstract Thursday, you can see that I've given my pic a colour change and a bit of a tweak with the 'PInch' filter in PS Elements.  The twin lines in the centre are a vapour trail.  The tiny black dots are birds winging their way to roost, and clearly not flying as high as the plane!