Slope
This is anti dirt. The dirt is becoming not dirt as it goes on, forming a... slope! Really what is the air above a slope but anti dirt?
This is some high level thinking, but I know you can do it. Picture a slope. Now picture an anti slope (like a negative image). It's all just dirt and anti dirt at the same time! Woah! Mind Freak!
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You need to know these kinds of things about slopes if you want to play soccer (さか). Soccer is pretty slope-intensive. You really have to know how to read their dirt and anti dirt to really get good.
Picture a slope. Now picture yourself playing soccer on the slope. Now picture your anti self playing soccer on the anti slope.