The picket fence There was a fence with spaces you could look through if you wanted to. An architect who saw this thing stood there one summer evening. Took out the spaces with great care and built a castle in the air. The fence was utterly dumbfounded, each post stood there with nothing round it. Christian Morgenstern, The Art of Looking Sideways www.andrew.cmu.edu spacearchitectureabsurdity
We are surrounded by ghosts An Article by David R. MacIver notebook.drmaciver.com I'd like to call the more general phenomenon that this is a specific instance of "ghost knowledge": It is knowledge that is present somewhere in the epistemic community, and is perhaps readily accessible to some central member of that community, but it is not really written down anywhere and it's not clear how to access it. Roughly what makes something ghost knowledge is two things: It is readily discoverable if you have trusted access to expert members of the community. It is almost completely inaccessible if you are not. In this sense, most knowledge is ghost, particularly if you take an expansive view of what counts as an epistemic community. knowledge