 The brunt of the isolation objection is that (doxastic) coherentism is unable to do justice to perception, for it does not require any genuinely perceptual contact with the world. But without perception, the whole of one’s beliefs is just another plausible story, not the one true description of things. (Even with perception, there is unlikely to be a single best belief set, but the number of equally good contenders will be vastly reduced.) For some time, BonJour (1985) thought that the problem could be solved with more beliefs; he required a candidate belief system to include a number of beliefs attributing reliability to beliefs that seem to be involuntary, noninferential, and directly caused by the outside world. But this solution seemed ad hoc, and it still didn’t require the belief set to be very highly constrained by perception; at best it constrained the belief set by what the agent believes to be perception, and even then, only those putatively perceptual beliefs about which she has favorable metabeliefs would need to constrain the rest of the system in any way. This seems to render perception epistemically “optional”, in an objectionable way.