"The Author diverts the Emperor and his Nobility of both Sexes in a very uncommon manner. The Diversions of the Court of Lilliput described. The Author hath his Liberty granted him upon certain Conditions."
Because Gulliver has been behaving so well, the emperor, his court, and the general population are beginning to trust him. Gulliver also has made a great deal of progress in learning the language and learning about the culture he is now such a large part of.
The emperor decides to entertain Gulliver by showing him a tradition of the court in which candidates for an open position of honor compete by walking to the middle of a string or tight-rope that is suspended two-and-a-half feet above the ground. They jump as high as they are able. "Whoever jumps the highest without falling succeeds in the Office." Gulliver tells the reader that very often these competitors are injured or fall to their death.