A Slave (n.) is what we wanted machines to be, and so we dread their revolt: the robot myth is the fear of a servant, when the machine is really a partner that needs a human coordinator among its kind.
A Slave (n.) is never a speaking tool: even the blind one who flees down the road from Larissa shows an organism with its own nature, which a tool lacks.
A Slave (n.) is a tool that has a will, for Aristotle, but the will is only the master's.
A Slave (n.) on the auction block, asked what he can do, answers: command men.
The Slave (n.) was an image before he was a fact, hardened over centuries by cumulative causality until Seneca forced a realization.