Invest the time and watch/listen to this video.

Here are the key points that called out to me.

I have put everything in a block quote because I'm not sure how much of the following was ad verbatim or paraphrased.

People function in two modes: open and closed. Creativity is not possible in the closed mode.

Close mode:

Open mode:

To be most effective we need to [be able to comfortably] switch back and forth between these two modes.

Conditions that are more likely to induce the open mode:

Find people you like and trust to play with. If just one person in the group makes you feel defensive, that is a sign of danger.

An intermediate state between open and close is impossible.

Thanks to Tammy Davenport for sharing this link.