This discussion originally arose in the thread "The answer to the 'Does God exist' question from Human Practice." I'm posting it in a new thread because by now it's a pretty deep tangent to the original thread and it's also an issue worth discussing in its own right. I am not arguing for solipsism. Obviously something 'objective' exists in some sense, because different people share the same experiences of an external reality. But what is the nature of this mysterious objective realm? Well, it is inter-subjective in that there are multiple subjective viewpoints of it. Is there something beyond and fundamentally different from these subjective viewpoints? If so, it is by definition impossible for us to come into direct contact with it; by extension, it is impossible for us to verify its existence. We can ascribe our varying subjective viewpoints to something that is fundamentally not subjective in nature (call it the Objective world, with apologies to the "Objective Subjective Dichotomy thread"), but this ascription can never be verified. Objective reality, in the sense that it is commonly used, is as much of a philosophical chimera as God; we can never verify that our assumptions about it are true, and so any argument we make about it runs the risk of being an unsound argument. Of course, it is also ultimately an assumption that there exist more than one subjective viewpoint, i.e. that I am not the only conscious being (thus contradicting solipsism). But I do not find this assumption as problematic as the assumption of Objective reality. Supposing that other humans are conscious only acknowledges a multiplicity of subjective viewpoints, something which I already know to exist (in myself). Supposing that Objective reality exists posits the existence of something that I can never touch (figuratively and literally) and whose nature differs fundamentally from anything I can possibly know. Furthermore, it introduces the mind-body problem: how can something that is fundamentally not 'mental' or 'conscious' in nature give rise to consciousness? Now, I am not arguing that Objective reality does not exist. I am merely arguing that, just as with God, we can never know for sure if it exists or not, and furthermore that supposing its existence raises a number of seemingly intractable philosophical problems. Therefore, we should retain at least some measure of doubt as to the existence of Objective reality.