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Visitors try to keep their balance in a tunnel with spiralling walls at the Museum of Illusions in Cairo, Egypt, on Feb. 9, 2021. (Xinhua/Ahmed Gomaa)
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People visit the Museum of Illusions in Cairo, Egypt, on Feb. 9, 2021. (Xinhua/Ahmed Gomaa)
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A visitor enjoys an interactive exhibition at the Museum of Illusions in Cairo, Egypt, on Feb. 9, 2021. (Xinhua/Ahmed Gomaa)
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Visitors enjoy an interactive exhibition at the Museum of Illusions in Cairo, Egypt, on Feb. 9, 2021. (Xinhua/Ahmed Gomaa)
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People visit the Museum of Illusions in Cairo, Egypt, on Feb. 9, 2021. (Xinhua/Ahmed Gomaa)
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A visitor enjoys an interactive exhibition at the Museum of Illusions in Cairo, Egypt, on Feb. 9, 2021. (Xinhua/Ahmed Gomaa)
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Visitors are seen in a room giving the illusion of different sizes at the Museum of Illusions in Cairo, Egypt, on Feb. 9, 2021. (Xinhua/Ahmed Gomaa)