New York City Ballet in George Balanchine’s Emeralds. Photograph: Paul Kolnik.

The closing image of the New York City Ballet production of George Balanchine’s production of The Nutcracker on its 2000th performance. Photograph: Paul Kolnik.

Alina Cojocaru and Rupert Pennefather in the Royal Ballet’s producton of George Balanchine’s Diamonds. Photograph: Johan Persson.

Frederick Earl Mosley’s Saddle Up, danced by Alvin Ailey American Dance Theatre. Photograph: Nan Melville.

Maurice Béjart’s Firebird, danced by Alvin Ailey American Dance Theatre

Elisabeth Holowchuk and Matthew Prescott of the Suzanne Farrell Ballet in George Balanchine’s Pithoprakta. Photograph: Linda Spillers.

Jeffrey Golladay, Maria Riccetto, Kristi Boone, and others In American Ballet Theatre production of Twyla Tharp’s “Baker’s Dozen”. Photograph: Andrea Mohin

Marcelo Gomes and Julie Kent in Antony Tudor’s The Leaves are Fading. Photograph: Andrea Mohin.

Jennifer Carlynn Kronenberg and other Miam City Ballet dancers in George Balanchine’s Emeralds. Photograph: Joe Gato.

Soledad Barrio and members of Noche Flamenca. Photograph: Andrea Mohin.

Merce Cunningham in his dance Signals. Photograph: James Klosty.

Ekaterina Kondaurova and Islom Baimuradov in Alexei Ratmansky’s Middle Duet

Merce Cunningham in his “Signals”. Photograph: James Klosty.

Maria Calegari in the original cast of Brahms/Handel, jointly choreographed for New York City Ballet by Jerome Robbins and Twyla Tharp

Eiko and Koma