I was browsing my reading list and noticed something about Open Space that said one of the hidden rules is that there is no need to apologize. Thinking about this over the weekend, I couldn't help reflect on the rules of Hacky Sack ("footbag"). The one I remember most clearly is that you don't apologize for making mistakes. (This is mentioned in the "Circle kicking" section of the Footbag entry in Wikipedia. Clearly, not as important as I recall.)
So is Open Space the meeting variant of Hacky Sack?