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optical illusion

noun
🔊/ˌɒptɪkl ɪˈluːʒn/
🔊/ˌɑːptɪkl ɪˈluːʒn/
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  1. something that tricks your eyes and makes you think that you can see something that is not there, or makes you see something as different from what it really is视错觉；错视；视觉幻象