Closedness is being gated in and not realizing that the gate is open and one can leave. Closedness is fear of change, fear of other, and fear of new ideas.
Closedness is aloneness and so-called security. It is greedy and insecure, holding on to all it can, with a grip of paranoia. It is about rightness over against happiness. It is about being right, being safe, and knowing. It results in missed opportunities for adventure and growth.
Closedness means one can dismiss information and others who believe or act differently. It is very lonely until it is joined with others and then it becomes toxic, and perhaps addictive, and even then, closedness means still being alone.
Where are you closed, that you are now ready to be open?