optical illusion
noun [ C ] uk/ˌɒp.tɪ.kəl ɪˈluː.ʒən/ us/ˌɑːp.tɪ.kəl ɪˈluː.ʒən/
视错觉;光幻觉
something that tricks your eyes and makes you think you see something that is not really there, or see it differently from how it really is
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