Yes, you can get circle patterned things like in the last panel which apparently will frighten off birds... supposedly because they register as a predator eye. I can't say how well they work, but that would be what's happening here.
Yes, you can get circle patterned things like in the last panel which apparently will frighten off birds... supposedly because they register as a predator eye. I can't say how well they work, but that would be what's happening here.
The addition of an actual eye on said circle probably helped.