 One of the features of dance as a performing art that has been often noted is that it moves and it changes, both during the course of any given performance and over time. A catchall phrase for this sort of impermanence—reflecting the lack of entirely stable art “objects” in every case—has been to say that “dance is an ephemeral art”, although there are alternative versions of what this means (see Conroy 2012; see also Copeland and Cohen 1983 and Copeland 1993. This does not mean that dance is insubstantial or unserious. Instead, what it means is that there is something vital about dance performances and events that disappears as it is being performed. As noted in  Section 3,  above, this may or may not distinguish dance from theater or music, although dance does seem to rely less on recordings and written notations in the making and performing of dances overall.