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"Here is a proud city. Full of happy prosperous citizens. They go on about their business, unaware that the moon mysteriously moved a few miles closer to the earth. Unaware, that is, until the tide comes in. Sploosh! Gisshhh! Calvin is playing on the beach. He builds a proud city, full of prosperous citizens. Calvin says they're unaware the moon has moved a few miles closer to the earth. They're unaware until the tide comes in. A big wave comes in and crashes into the sand city."