e.g. The pattern of these lines creates an illusion that they are constantly moving in a circular motion even though they aren't.
e.g. The illusion of a happy family disappears once all their guests and friends leave.
e.g. She had an illusion about her friend's family life which turned out to not be as great as she imagined.
e.g. Adding full-sized windows or mirror can create an illusion of a bigger living space.
pie in the sky
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