"Grool!" is what she settles on, giggling. "Okay, so, I guess I can compare the tendons here and..."

It's much easier when she has more of an idea of what she's aiming for like that, especially when she can compare directly. First she makes the tendons between ring and pinky more like the others; then, she changes all of the intersections so that all of her fingers are effectively independent of all others. Finally, she repeats the procedure on her other hand, without making its skin invisible first. That takes longer.

She wiggles them in front of her face, thirty-two minutes after she's started, grinning. "I think I'll keep this one," she says.