‘There,’ she said. ‘That’s another s’prise-secret. When you draw a hissy-snake by the door of your little back-cave where you mend the spears, I’ll know you’re thinking hard; and I’ll come in most mousy-quiet. And if you draw it on a tree by the river when you are fishing, I’ll know you want me to walk most most mousy-quiet, so as not to shake the banks.’