twiching toes

I first noticed it with Sparkle. When I'm teaching her something a little bit tough, her toes start to twitch. It's one of the signs I use to tell me to go slowly.

Recently I found out that Glitter does the same thing. She twitches her toes when she thinks something is too tough.

I don't think that either kid is aware of the toe twitching. I would have never know if we weren't barefoot homeschoolers.