Ethlyn looked around at the tunnel again. That explained how Toph was able to get the sides so perfectly smooth.

"So that's how you have such precision. And how you were moving so smoothly over the ground in the pastures outside." Not to mention how she put those pastures back. If she could perceive everything, even the roots of the grass, it would just be a matter of practice. And if Toph had been blind her whole life, she would have had lots of practice.

"What if you were to make a--a platform out of earth? Could you move it alongside you the same way?" Ethlyn asked, an idea taking shape in her head like the shape of the tunnels.