"Look Grandad," said Lucy. "This circle is your comfort zone and the things you like doing, like gardening and picnics, are inside it. Outside are new and frightening things.
But if you do the frightening thing, you usually find that it’s alright. And then, the thing that was frightening goes inside your circle. Your comfort zone gets bigger."
"Hmm," said Grandad, "Alright Lucy, I’ll try … if you help me."