The "twittering" in the title doubtless refers to the birds, while the "machine" is suggested by the hand crank. The two elements are, literally, a fusing of the natural with the industrial world. Each bird stands with beak open, poised as if to announce the moment when the misty cool blue of night gives way to the pink glow of dawn. The scene evokes an abbreviated pastoral—but the birds are shackled to their perch, which is in turn connected to the hand crank. (...)