"(2) A friend recently taught me to fold origami paper cranes. In walking me through the various steps, she often had to explain by some combination of words, pointing, and demonstrations where and how to fold next. The intermediate forms don't look much like cranes, and the paper keeps taking on unexpected new identities as you fold it, even after you've gotten reasonably proficient. These forms can be hard to talk about because they're importantly asymmetrical in nonobvious ways. Even demonstrations are only of limited use if you can't see the asymmetries for yourself. "

So true.