Daily Writing Blurb

It wasn't as though the two worlds, so to speak, had never communicated. But, when that wall came down, it was truly the meeting of two alien cultures. Suddenly, there was no wall, no obstruction, and he could see houses - normal houses, normal neighbors, normal gardens... But the mystery of the wall nagged at him. Why force such an unnecessary separation?

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Prompt: (c) Promptuarium.