The box has many facets. I fear that to define them all, that would put me in a box too, but I'll try.
People act as if meaningless things in society define who they are--things like money, possessions, music, tv, movies, the past, their career. Few think about who they want to be or how they want to live. They allow that to be defined for them.
The box can be dangerous. Humans survived for a very long time with no electricity. Now, many depend on it to the degree that they don't know how to survive without it. The ice storm knocked out power to millions, but few realize it also provided abundant firewood for heat and plenty of easily-obtainable drinking water which is probably more pure that what most usually drink.
Many make psychological or social boxes for themselves. They are trapped by their own thought habits, which they repeat as if they were an emo teenager cutting themselves. Some settle for friends which hinder their personal growth and impose pointless expectations.
The box is deceptive, because it is created by our own mind. It knows how to trap us. But, if we know the limits of our mind, I think we are capable of exceeding them.