Water? [She examines the sand again-- wait! Soil! It's all starting to make sense.] Of course! Because it's porous, so the water acts like a binder! Genius!

[Anyway, Tendi looks a little dubious at the sound of a contest.] I don't know if it'll be the best, but it could be fun to try anyway, right? Wanna join me? I totally get if you want to make your own, though. This stuff is super cool.