There is something. All that there is, we generally call “reality”. Note that by this definition, reality is unique. The corollary is, we all live in the same reality. We do not percieve it in the same way, but our perceptions and reality itself aren’t the same thing.
I interpreted this to mean, “a shared reality external to myself and others does definitely exist”, which is too strong a statement. But it’s possible that my interpretation was wrong.
I do not exclude in that statement that we all live in totally separate parts of reality (Everett branches, light cones, or whatever). In this case the text I am answering to doesn’t come from an agent. (You can apply the same reasoning to yourself and my text.)
Of course, I have empirical reasons to believe that you are an agent, and that we are interacting, and therefore we are part of the same whole in a stronger sense.
I think at this point it might be helpful to taboo “reality”. I would rewrite your statement as something like this:
If my senses are transmitting perceptions that appear to be the result of my interaction with another agent, then, assuming that the agent does indeed have the ability to operate independently of myself, that agent and I share at least one communication channel that is common to both of us.
That sentence is unwieldy and, frankly, boring, but it does avoid making unwarranted assertions.
That said, going into this much detail is probably not useful. If you and your interlocutor can’t even agree on whether both of you exist, there probably isn’t much room for productive dialogue.
Fair enough, but the full quote from the OP says:
I interpreted this to mean, “a shared reality external to myself and others does definitely exist”, which is too strong a statement. But it’s possible that my interpretation was wrong.
I do not exclude in that statement that we all live in totally separate parts of reality (Everett branches, light cones, or whatever). In this case the text I am answering to doesn’t come from an agent. (You can apply the same reasoning to yourself and my text.)
Of course, I have empirical reasons to believe that you are an agent, and that we are interacting, and therefore we are part of the same whole in a stronger sense.
If I’m interacting with somebody(say, via philosophical argument), we share a reality.
I think at this point it might be helpful to taboo “reality”. I would rewrite your statement as something like this:
That sentence is unwieldy and, frankly, boring, but it does avoid making unwarranted assertions.
That said, going into this much detail is probably not useful. If you and your interlocutor can’t even agree on whether both of you exist, there probably isn’t much room for productive dialogue.