What's creating bizarre sand sculptures along Lake Michigan?

At first glance they look like the objects from an alien planet. Maybe Mars? Except there's a beach in the background and Mars doesn't have any of that. But where on Earth would someone find dozens of petrified totems of sand?
At first glance they look like the objects from an alien planet. Maybe Mars? Except there's a beach in the background and Mars doesn't have any of that. But where on Earth would someone find dozens of petrified totems of sand?

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