In any teacher trainer workshop or webinar when asked for ideas on a given picture, a given quote, etc there will be a constant flow of ideas coming in from keen teachers willing to have their say, often ideas are mediocre at most compared to what the speaker will enlighten us with but it's ideas, it's a willingness to participating
Put the same situation into a classroom and ideas, the same method, the same show a photo and elicit ideas technique and students go quiet.