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jaimeastorga2000 comments on Harry Potter and the Methods of Rationality discussion thread, part 7 - Less Wrong
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Ch. 67: why does metal stop spells while cloth doesn't? It's not as if spells pierced clothes and made holes where they hit. If it's about tiny holes in fabric, something like permeability to water, would plastic bags work as well as metal? If it's about thickness, would styrofoam do? And if it's honestly about metal, how about aluminum foil?
This is a good question for gaining insight into the way spells work, and it seems like an easy one to investigate - one just needs to shoot several spells at another person through a bunch of shields made of different materials and of varying thicknesses, then check if any patterns emerge. If Harry's not too busy, he should look into it.