The flag should never be depicted, displayed or flown upside down. Tradition also states that when draped vertically, the flag should not merely be rotated 90 degrees, but also reversed. One "reads" a flag like the pages of a book, from top to bottom and from left to right, and after rotation the results should be the same. It is considered insulting to display the flag in a frayed or dirty state, and the same rule applies to the flagpoles and halyards used to hoist the flag, which should always be in a proper state of maintenance.