In the actions of the human body, in the motion of water waves and in other natural phenomena, Leonardo saw a law of harmony at work: each individual movement is combined with all of the others in orderly manner to form a harmonious ensemble. This harmony emerges not only in his works of art but also in his studies of mechanical contrivances. In fact, Leonardo deems harmonic the motions that take place in an orderly kinematic sequence, such as those of automatons.