Things keep landing on my lawn

If anyone checks my last Saturday blip they will see the biscuit that fell from heaven. Today brings another ghostly phenomenon. I stepped out on to my lawn this morning to be confronted by a bubble. No other bubbles in the air. No sound of child with bubble blower. No outdoor washerwomen at work. Just this solitary bubble sitting there. It sat there for about half an hour getting smaller and smaller until it just faded away. I wait to see what descends next week. 
I decided it deserved a blip so I created an abstract from it. A kind of wave in a bubble. You can see it in context in the extra.