Bob had an Afghan hound called Ace, and he brought him to class and he'd lie under the piano, and the moment class finished he'd spring to his feet and do leaps across the floor and look at himself in the mirror.
This opening material is from the first solo Bob danced for Martha Graham in 1946, in a role he took over from Merce Cunningham.
When Bob choreographs he doesn't look at the dancers, but instead he covers his eyes and visualises the dance in his head, and then looks, and covers his eyes again.
Yes, he says, it's very simple, when I dance I really feel like it's the inside coming outside.
(To the tune of J.S. Bach's Chaconne from Partita No. 2 BWV 1004)