The purpose of an animals shell is to protect them from danger.
Humans don’t have physical shells but we do have actions and behaviours that we express in order to protect ourselves.
So, let us play around with the metaphor of us humans having shells.
Perhaps you’re closed off around new people to protect yourself from getting hurt. And in some situations that might save you a lot of hassle and be a useful thing to do.
But what about when it’s time to be vulnerable or what about when you don’t actually need to protect yourself as there is no danger present.
As much as it’s great to know how to protect yourself it’s important to also remember that you don’t need to do it all the time.