My idea is about merging the first and third space.
In this idea I would interact with the viewers in the third space by answering questions, drawing etc. However I myself would have no direct contact to the third space. I would be standing on a big piece of paper with a camera videoing me but I would have no access to any screens. I would react to what my assistant reads on their screen. So I would be fully aware of the first space while interacting with people in the third space.
Very interesting idea! In other words, your contact with the third space space is mediated by someone in the first space, rather than the screen. Is this a way of preserving the integrity of the first space? Not losing your sense of presence in the first space? I look forward to discussing.