Penny Clear

Why do clear bags with a penny and water hung up keep flies away?

I have seen this in bars and at pools, so I tried it and it works.
Is it the flies vision or what is it that makes it work?

Anatomically speaking, flies have great eyesight. They are also very spooking and will avoid movement. Try to sneak up on a fly and you will see what I mean.

The bags cause a shift in light, causing shadows and what the flies percieve as movement. They will avoid this.

It will not work on mosquitos, gnats, etc as their eyesight is poor.

How to clean a old penny with craft crazy

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