Fleeting things are items or events that are short-lived and often considered to be of little importance. The term 'ephemera' is used to describe these types of items, which can include postcards, tickets, and other paper memorabilia. Ephemera is derived from the Greek word ephemeros, meaning 'lasting only one day.' This term is often used to refer to items that are not meant to be kept for long periods of time, such as newspaper clippings, photographs, and other items that may have sentimental value but are not meant to be kept forever.