Final answer:
The motivation of both creators in animating a lifeless body is best characterized as obsessive, as they show deep commitment and absorption in expressing specific messages or emotions through their art.
Step-by-step explanation:
The motivation of creators to animate a lifeless body, as implied by the quotes provided, can be best characterized as obsessive. The desire to create, manipulate, or even destroy life or life-like figures for the sake of art, self-expression, or to make a statement demonstrates a level of absorption in their work that can be considered an obsession. For example, the artist described by Beth chooses to depict a non-naturalistic figure to capture timelessness and perpetual devotion, a decision that reflects an obsessive commitment to convey a specific message or emotion. Similarly, Peter Brook talks about actors who obsessively use their own experiences to craft characters that are ultimately transient, and John Baldessari’s Cremation Project shows an obsessive move to redefine his career by burning his early work to emphasize the ephemeral nature of physical art compared to conceptual ideas.