This only gives pseudo-symmetry, but a shopkeeper, not knowing, would think of it as symmetry and treat you fairly, as an equal.
Many shopkeepers use fake camera look-alikes, and other decoys.
It is ethical and reasonable for individuals to do the same during the times when they are under surveillance. Make some extra darkglass objects and give them as gifts. Give a friend the gift of symmetry. I'd be delighted if someone gave me a darkglass ball with a little antenna sticking out of it. I'd carry it to the MIT bookstore when I was purchasing my course textbooks.