What is unusual about the piano player at the concert Jerome and Irene attend?

The piano player at the concert Jerome and Irene attend is notable for having 12 fingers. This characteristic is exceptional because it gives him a unique advantage in playing the piano, as he can potentially reach a wider range of notes and create complex sequences that a typical pianist with 10 fingers might find challenging. In the context of the film GATTACA, where genetic engineering plays a significant role, this attribute highlights the emphasis on genetic enhancements and superiority that is a critical theme throughout the story. It not only serves as a fascinating aspect of the character but also underscores the societal obsession with genetic perfection and the extremes to which individuals will go in order to be recognized for their talents.