你好 Mandy There are some very short people live in southern Africa, who are known as 'pygmies', although this word is probably not appropriate. However, Jonathan Swift, in 1726, would not have known about them, as he was writing before they were discovered by European explorers more than a hundred years later, in the next century. His novel is a satire on [makes fun of / makes a joke of] the attitudes and behaviour of the people of his time. Your expression 'the world will upside down' became popular, and there are a number of public houses [bars] in England with this name. It originates [comes from] a protest song written in the 1640s during the English Civil War, against the austere attitude of Parliament towards celebrating Christmas, saying "you see the world turn'd upside down." Swift would have known about that, and may well have thought that in 'Gulliver's Travels', he was showing a 'world turn'd upside down'.