But in practice we can clearly define some things objectively. If that were truly impossible, we would be unable to share common languages to any degree and it would be impossible for two separate cultures to communicate.
At some level reality itself may be an illusion and we can never be sure of time and space. However, if we concede that point, then we concede that potentially nothing exists then we cannot debate it because we don't exist either. So even by discussing a matter we are taking an assumption that we exist and that something exists for us to talk about, even if the precise meaning of the words isn't nailed down by anyone. At this point, postmodernism starts to look a bit weak, because to communicate we must assume some shared reality between two parties which is quite possibly going to be objective by both parties standards.
And in the framework of human endevour, there are a huge number of hypothetical realities we have ruled out by scientific experiment. It is overwhelmingly likely at this point that something objective exists and we've narrowed in on it quite a bit from, say, 10,000 BC.
At some level reality itself may be an illusion and we can never be sure of time and space. However, if we concede that point, then we concede that potentially nothing exists then we cannot debate it because we don't exist either. So even by discussing a matter we are taking an assumption that we exist and that something exists for us to talk about, even if the precise meaning of the words isn't nailed down by anyone. At this point, postmodernism starts to look a bit weak, because to communicate we must assume some shared reality between two parties which is quite possibly going to be objective by both parties standards.
And in the framework of human endevour, there are a huge number of hypothetical realities we have ruled out by scientific experiment. It is overwhelmingly likely at this point that something objective exists and we've narrowed in on it quite a bit from, say, 10,000 BC.