The simplest and earliest time travel machines were crystal balls
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Modern timeships are far more complex, but still glass: fragile nets of tubules and alembics; mirrors and lenses at just the right angle—
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to transport the device itself and not just the operator, we had to figure out how to make the crystal ball see itself
a moebius-time-loop construction was finally successful
as a side-effect, all full-powered time machines are conscious
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