Looking OUTSIDE the park?

I recently discovered a remarkable author and artist named Anne Truitt. I was searching through the maze of shelves at Half-Price Books (one of favorite pasttimes) when I found one of her memoirs, entitled Daybook. In it she recounts the time, when she had taken her daughters and a couple of their friends to a Botanical garden for the afternoon. She shares that the oldest girl and her friend had wandered off, and as the guards came around to lock the place up, she couldn't find them. She enlisted the help of the security force, but after a lengthy search, she gave up and headed home (this is pre-cell phone days, folks!) to continue the search. But I'll let her tell you about it...

'...finally returned home to find Alexandra had asked a policeman to drive them back to our house. The fact that struck me, appalled by my own stupidity, was that she and her friend had gone through the gates ahead of us--and I had never thought of looking for them outside the garden. I had been stuck in my preconception that they must be inside because I had seen them there. From that time forward, I have always tried to remember to reverse solutions when I sensed the sticking feeling that marked unintelligent behavior.'

Where do you need to reverse things in order to find a better solution? I remember one of the prompts in Roger Von Oech's Creative Whack Pack was 'turn it upside down'...so, take your problem and play with it...reverse it, turn it upside down and inside out...what do you see?