( optical illusions)
An optical illusion is something that tricks your eyes so that what you think you see is different from what is really there.
Sloping walls on the bulk of the building create an optical illusion.
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( optical illusions)
An optical illusion is something that tricks your eyes so that what you think you see is different from what is really there.
Sloping walls on the bulk of the building create an optical illusion.
N-COUNT
Collins COBUILD Advanced Learner's English Dictionary. Английский словарь Коллинз COBUILD для изучающих язык на продвинутом уровне. 2006