Tethered

On my way home after a good chat over coffee with Chamaeleo I found a white helium balloon tethered to a drainpipe. In the wind it seemed to have a mind of its own as it knocked alternately at the net-curtained sash window and the closed door. A pallid version of that red one.
 
I wonder whether someone is coming back for it or whether it’s a donation to those of us who happen to notice it.