NihilCredo 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?
I suspect plastic and refined aluminium are Muggle-only technologies.