Think outside the box has come to symbolize the point in the conversation when people are going to think creatively. As if prior to that point everyone has been thinking inside the box.
Who brought the box to the meeting? Whose box is it? Do we each have our own box? Is my box different than yours?
What if we threw the box away? What if we never had the box in the first place?
Let's quit placing parameters on ourselves and embrace the concept that if you can think, then you can think creatively.
Open your mind to the possibilities and understand that you don't have to come up with a great idea, just come up with any idea. Ideas tend to breed other ideas. Once they start growing then you have the potential to develop one, or two, or three, that can be great.
Don't look for a "Eureka!" moment. Be on the lookout for the "Wow, that's interesting." moment.
As for the box, let it serve as a container of supplies, not ideas.