“Some materials can't be reshaped, like wood. Some kinds of fine detail are easier to make with tools. And if you need a lot of something, it's faster to use machines to make it than to have someone claim all the materials first. But if there's no reason not to, then you do.”
The empty glass globe from a previous demonstration rises up, then shrinks to the size of a tennis ball.
“This is all the same matter in a smaller space, but the glass is thicker and the air is compressed. It would burst if it weren't reinforced.”
“No, it's just trapped. It's really hard to keep a claim on air because it moves around all the time.”
Pause.
“Apparently nobody has fine enough control to slow down the air enough to keep it, and if you could anyway you would just have liquid air, because that's the difference between a liquid and a gas anyway.”
“It's the same thing. Heat is what we call individual molecules moving around or vibrating.”
“Yes, there are ways that you can hurt yourself. But there are more ways you can hurt yourself if you don't have control! You could stumble and hurt your unreinforced ankles and be unable to travel out in the wild like this!”
(Pause. Deep breath. Stop complaining about the entirely unreasonable situation (he has been not-thinking about what is going on here, because the evidence is accumulating in the wrong way, and even that doesn't make sense, not really) to the person in that situation. Don't scare the kid.)
He sits down on the rock.
“Sorry. I'm just worried a— for you.”
“It's just — nobody lives this way. And if it was a good tradeoff, I'm sure someone would have tried it and stuck with it, and I haven't heard of anyone doing that.”
“You just have to try to do it, like you did with the glass. It would be hard because bodies are complicated, but because it's your body that you can feel, that helps. You should practice with stuff that isn't so important first, though. It's not like you would likely seriously injure yourself if you make a mistake, because you can usually feel it and stop, but interesting kinds of bruises are a thing.”
“If you got any at all, you would lose it as it flowed out of your hand and mixed with other blood in the other parts of your body. It's sort of like how you can't claim a gas, but you can claim a liquid, because it doesn't mix up quite as fast, but you still have to try harder. Once you have your entire body, that won't be a problem.
“You should be able to feel it a bit, anyway.”
If she pays attention, her hand is a bit like the pencil with its wood core — there is stuff inside it that isn't hers yet. Presumably that's the blood.
“How about we go down to the beach and get you some more glass?” (To practice with.)
“Glass is really easy to claim, and it's transparent unless you add something to it, and it makes really tough things with a bit of reinforcement, so it's useful for a lot of things. Metal is easy too but expensive, and you use it when you need it, like that electric circuit. Really, any time you need more than a particular shape, you might need something other than glass.”
The bird-bodies take off in other directions.
He points at the thing over their head. “Silver for the mirror, aluminum and glass in the engine.”
“And I have some plastic, which is good for small flexible things. But since you included my body in that list, I assume you meant to ask about my entire kortarem, not just stuff that's suitable to be reshaped. I also have food and water, and my computer and radio, of course. Soap. Odds and ends.”