An obelisk is a tall, narrow, four-sided, tapering monument which ends in a pyramidal top. Ancient obelisks were made of a single piece of stone, a monolith; however, most modern obelisks are made of individual stones, and can even have interior spaces. The original form is Egyptian and all subsequent versions are derived from the original Egyptian pattern. The term stele (plural: stelae) is generally used for other monumental standing inscribed sculpted stones. Because of the Enlightenment-era association of Egypt with mortuary arts, (and generally with great antiquity), obelisks became associated with timelessness and memorialization. There are many smaller obelisks or similar forms to be found in European and American cemeteries, and may be from a few meters in height.