In the latest beauty craze sweeping social media in China,women--and even some men--are boasting that they are paper thin,by posting photographs of their waists behind a vertical piece of A4 paper.To qualify,the waist must be entirely hidden by the paper.A piece of A4 paper is 8.3 by ll.7 inches,roughly the size of a sheet of American letter paper.  With the A4 Waist,the trend is attracting hundreds of photographs and thousands of comments on Weibo and other social media networks like Weixin or WeChat.Being abnormally thin is a widespread standard of beauty for women,one that has been criticized as an unhealthy ideal of female attractiveness.  The tiny waist has a long tradition in China,going back at least to King Ling of Chu,who ruled from 540 to 529 B.C.Many in China know the passage from the Book of Han,the history of the Western Han Dynasty:"The King of Chu loved a narrow waist.Many people at court starved to death.'' Several commentators have found the A4 trend disturbing.In a telephone interview,He Xiaobin,senior fashion features editor at the Chinese edition of GQ magazine,said,"I find it completely stupid.Everybody has a different frame and body shape.Using a single size to define all human beings and thinking you have created a new standard is foolish.''The A4 waist challenge annoyed him,saying that it allows certain people to gain bragging rights,while leaving others in depression.  Luckily,some who do not qualify are turning to humor for comfort.Can they substitute a different paper size,such as A3,which is 11.7 inches across Or measure a body part besides the waist? According to He Xiaobin,showing A4 waist in social media is  _   .
traditional challenging disturbing instructive