Granular convection

What is wrong with this picture?

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Random wall somewhere between Mölln and Hamburg

Don’t you guys make your parents stop the car when you drive by newly built walls in random villages somewhere when they are a perfect example of what the Paranuss-Effekt (Brazil nut effect, or granular convection, for all you non-german-speakers) does NOT look like?

For comparison, this is what it SHOULD look like:

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My emergency snacks. Why is it always so hard to get the sunflower seeds out of a jar of mixed nuts?

Yep. Granular convection!

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