False reflection

You need to look at this LARGE to see what it is, and even then it's not obvious.... It is a photo taken from below my bare mulberry tree, looking up at the dull grey sky. I played a bit in PS with the liquify filter, and it looks s bit like a reflection - but not quite.

Hopefully I'll find something outside of my garden to blip tomorrow, as I'm running out of things to photograph with most of the plants in winter hibernation.

I'm not at all sure I should have posted this one; it might have been better to leave it a day!