The Berliner bubble maker

I was walking around the Hackescher Markt, when I noticed tiny bubbles suspended in the air. I turned my head around to look for the origin of them and I saw this dedicated bubble maker, using just a piece of rope attached between two sticks. I approached him and started shooting. “It's all about having the right bubble solution”, he said promptly and loudly. I am not sure if it was the wind or the bubble maker trying to help me with my shot, but I was able of capturing this unexpected picture.

Done