The Box is the rules that exist in your mind. They define what you believe is allowed and what is forbidden. The box does not provide you with a certain point of view, it just defines which point of views you may or may not take on a certain subject.
Just recently I had a discussion about how to remove those boundaries for the mind. One way to do it is to become someone else for the time being. Imagine you are a different person, someone that conventions do not apply to. Take it to the extremes. You'll learn to see different ways out of a deadlock.
So what is my box? How do I even recognise what the rules are that I comply with? Which of those rules are necessary or sensible, which do nothing but to hinder my growth?
In that particular discussion I discovered the following effect of The Box: growing up. Children have a sense of wonder about everything that lives or just is on this world. They confront new things, beings, ideas with a sense of astonishment and curiousity. Then the school system kicks in and takes the astonishment and with it, cripples the curiousity. Everything is predigested. Nobody is allowed to find a different solution to the "problems" presented.
I was dumb struck when I first read the "Truckers, Diggers, Wings" triology by Terry Pratchett. I was really lucky that I somehow missed the classification as "childrens books".
In it, there are beings that simply have a different point of view because they are so much smaller than people. Sounds familiar? One of the episodes describes the little beings¥ explanation for wind: The trees are swaying and therefore causing the air to move.
A brilliant metaphor for the box. Of course we know that it is the other way round. We know it so precisely that we do not realise that the trees - by presenting a negative acceleration factor for the wind - contribute to the overall air speed. So there is an interaction between wind and tree that is bi-directional. The view that the movement of the trees causes the wind is suddenly not so absurd anymore, it becomes absolutely legitimate.
This sort of thinking is required when you want to remove the boundaries that restrict your mind and fantasy.