Do you remember the magic eye pictures? They were sooo popular back when, the 90's?
In my book, when Gracie tries to tune into the voices in her head, I mention that it's like trying to view one of those magic eye pictures; the first time you try to do it you struggle, but once you know what you're doing, you wonder why you ever had a problem.
Are you any good at magic eyes? Here's a test for you:-
Can you see it?