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It's the idea that human consciousness is a unity as well as a joint experience! Namely, that when one experiences a noise and a pain at once, it isn't that you're conscious of just the noise and then, separately, the pain. You experience them together. The same can be applied to humans and their consciousness - you aren't aware of a human experience separately from the human. So taking a human from their home suddenly and planting them in a parallel universe that exists outside of time implies that there isn't a unity at all.