In his latest Common Space post, Open vs. open vs. etc, telecentre.org Director Mark Surman mulls over a question that those of us involved in OCW projects might have some interest in: “why are so many people attracted to the word ‘open’?” A 30-minute thought experiment led Mark to create a chart comparing four common ‘domains of open’: open source software, open space meetings, open societies and open systems. In future iterations of the chart, Mark will compare other domains, including open content and open education. Have specific insight you feel might help Mark and others better understand the ‘meaning of open’? Send along your thoughts.