“It's all shaped and forcepatterned for the moving parts, so you need to learn the shapes. You need metal to make the hot and cold ends, and something black, and a few other materials to make it more efficient but it could work with just metal and glass.”
“There aren't any stores to sell it right here, anyway. I can give you some energy for now, or make you another engine you can hook up to, and you can get metal for yourself later. There are other ways to collect energy, too, like from waterfalls or waves or wind.”
“Anyway, give this a try. Spread out some glass, put another piece above it, and make the connection. But before you were doing patterns that were only about how far away things are. This one is only about which way they are moving, towards or away, it always pushes in the opposite direction. Both at once can be done too.”
Elsewhere on the beach, the mock-bird-people land.
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“Sure, if you're only using it as slow as those sources provide it. Or if you find a really big waterfall, or a dam, of course.”
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This time, the thing he gives her isn't a transparent sphere. It's an orange dumbbell.
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It's perfectly happy to stay where she puts it in midair.
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He points at the ring of thin glass on the sand around them that followed them down from the rock.
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Elsewhere on the beach, the mock-bird-people land.
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