Why do they pile the sand up

Shaz took some piccies of it
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But I am still curious, do they do this to avoid it blowing away in winter storms? Or so it can be cleaned? Or so it can have a sand party? To stop stray cats doing there business on it?
It's one of them things that I have the bit between my teeth over and need to know the answer
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But I am still curious, do they do this to avoid it blowing away in winter storms? Or so it can be cleaned? Or so it can have a sand party? To stop stray cats doing there business on it?
It's one of them things that I have the bit between my teeth over and need to know the answer
