illusion, Visual illusion,Optical illusion. 錯覺, 錯視, 錯視

By sitting, standing or lying on the horizontal surface, visitors appear to be scaling or hanging off the side of the building
Leandro Erlich's Swimming Pool creates the illusion visitors are underwater | Daily Mail Online
Read more: http://www.dailymail.co.uk/travel/travel_news/article-3393808/Don-t-worry-not-drowning-fake-swimming-pool-creates-illusion-visitors-submersed-nine-feet-water.html#ixzz3wy8dwtxH
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Optical illusion - Wikipedia, the free encyclopedia

An optical illusion (also called a visual illusion)

錯視

錯視(Visual illusion,Optical illusion)

錯覺(illusion)