A crucial difference between hypervideo and hypertext is the element of time. Text is normally static, while a video is necessarily dynamic; the content of the video changes with time. Consequently, hypervideo has different technical, aesthetics, and rhetorical requirements than a static hypertext page. For example, hypervideo might involve the creation of a link from an object in a video that is visible for only a certain duration. It is therefore necessary to segment the video appropriately and add the metadata required to link from frames—or even objects—in a video to the pertinent information in other media forms.