This picture is confusing everyone on the internet. Can you figure out what it is?

A tweet from a woman named Becky has gone viral and is blowing everybody's mind. Is the picture in the tweet below a beach or a door?

I don't have a keen eye and my attention to detail is extremely shabby. If you tell me an answer with the slightest bit of confidence I'll probably believe you.

We need you to weigh in.

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