Michel Fokine completed the dance in three or four rehearsals. He later wrote that the ballet was almost an improvisation. Grace Robert writes in "The Borzoi Book of Ballets" that "Spectre" is a "pas de deux", but not the sort of "pas de deux" that looks back to complex 19th-century technique and virtuosity. Instead, it is a forward-looking, modern dance of continuous movement and expressiveness. 