The most well-known arguments for externalism typically make use of thought-experiments in which physically identical individuals are embedded in different social or physical environments.
A dead girl, physically identical to Cassie in every respect, is found in a ruined cottage in County Wicklow.
A reboot starts tonight on NBC, with the characters eleven years older but somehow physically identical to how we last found them.
The new Kindle is physically identical to Amazon's current Kindle, with its slender profile, six-inch black-and-gray screen and angular keyboard.
Gemli puts it bluntly: " The zombie argument is silly, as a physically identical being couldn't be identical and not have the same experiences".
To answer it, "I assume the possible existence of a zombie that is physically identical to me, but has no subjective experience".
Many critics of the Zombie Argument do argue that a zombie-twin is not possible, on the grounds that physically identical beings must have the same experiences.
Not the brain-eating undead of movies, but a philosophical zombie, defined as physically identical to you or me but utterly lacking in internal subjective experience.
So in an alternative universe, there could (logically) be a being physically identical to me but with no experiences: my zombie-twin.
"The theory is that if you had two apartment houses that were physically identical, there should be no difference in property taxes simply because one of the buildings is a co-op or a condominium," he said.
It's pretty easy to imagine a zombie, Chalmers argued — a creature physically identical to a human, functioning in all the right ways, having conversations, sitting on park benches, playing the flute, but simply lacking all conscious experience.
