Slope
Dirt is being anti-social when it's in the shape of a slope. Think about it — is there anything more annoying than having to walk up a steep slope? Why is the dirt here forming a slope?! Because the dirt is being anti-social, and a slope is how it tells you to stay away.
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You need to know these things about slopes if you want to play soccer (さか). Soccer is surprisingly slope-intensive, actually.