"Sure, but... people pick up on all kinds of tiny hidden phenomena that don't seem significant. They become quirks of physics, not magic- ordinary, mundane things. The question is, why would these be different? If anyone can do the blotch thing, why is that a secret magic technique and not... no more special than being able to raise one eyebrow, or break glass with a high pitch?"

He thinks for a second.

"Actually... are there things like that, which people discovered but just treat as normal and ignore because they're useless?"