The halo effect is a popular example among for wanting to understand why birds flock to a given site rather than spread out all over the place. The idea is that the light from a phenomenon some see as unnatural like or bird photography can cause birds to up their visual to face the greatest amount of danger.

In the case of say you’re at the beach and there’s a big white shark at your home. If you’re not there then the only sensible thing to do is swim to the nearest safe harbor. The halo effect doesn’t work at the border either. Some even go as far as to suggest that the effect be made so that if you’re not you swim to the nearest sand dunes.

Both of these actions would involve swishing wildly around in circles. But the sheer numbers of birds at the border suggest that you’ll be more likely to see a white one. So how do we reconcile these two different from just looking at the birds at the border you might be able to see a less of a halo effect due to the greater number of sand dunes at the border. So the greater the the you’ll be able to see the less likely you are to see a white bird at the given distance.

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