Dancers prepare for the 63rd Opera Ball in Vienna(1/5)

Dancers of the State Opera Ballet perform in the ballroom during the dress rehearsal for the traditional Vienna Opera Ball at the Wiener Staatsoper (Vienna State Opera), in Vienna, Austria, Feb. 27 2019. The Vienna Opera Ball takes place on 28 February. (Photo/Agencies)

Dancers of the State Opera Ballet perform in the ballroom during the dress rehearsal for the traditional Vienna Opera Ball at the Wiener Staatsoper (Vienna State Opera), in Vienna, Austria, Feb. 27 2019. The Vienna Opera Ball takes place on 28 February. (Photo/Agencies)

Dancers of the State Opera Ballet perform in the ballroom during the dress rehearsal for the traditional Vienna Opera Ball at the Wiener Staatsoper (Vienna State Opera), in Vienna, Austria, Feb. 27 2019. The Vienna Opera Ball takes place on 28 February. (Photo/Agencies)

Dancers of the State Opera Ballet perform in the ballroom during the dress rehearsal for the traditional Vienna Opera Ball at the Wiener Staatsoper (Vienna State Opera), in Vienna, Austria, Feb. 27 2019. The Vienna Opera Ball takes place on 28 February. (Photo/Agencies)

Dancers of the State Opera Ballet perform in the ballroom during the dress rehearsal for the traditional Vienna Opera Ball at the Wiener Staatsoper (Vienna State Opera), in Vienna, Austria, Feb. 27 2019. The Vienna Opera Ball takes place on 28 February. (Photo/Agencies)