The reality of the world in which you find yourself, its contrast with and transcendence over any and all constructions of mind, its stone-kicking incorrigibility, is more than obvious, it is the original of all evidence. But isn't it just this perfection of invariable and law-giving otherness which makes it suspect? If you take idealism at all seriously it entails that you as subject-object can in no way dissolve external reality into yourself as much as the idea of doing so would persistently haunt you. If pure self-knowing subjectivity projects a duality of subject knowing object it must in the first instance be just so as to not be recuperable, to be definitively out there, to be precisely the refutation of idealism, to hold up and respond to every attempt at understanding. This seems like such a sophistry, proving the case by the very impossibility of the case, but it holds up under closer scrutiny. The deep seated intuition against idealism is the form in which the intuition of idealism must exist. And further that it be the irritant that keeps destroying any clear formulation of the distinction between say reality and mind, or nature and observer, or more crudely between physics and the 'hard' type of consciousness. And if that were the only evidence then it locates exactly where the challenge lies.