In the Alforja cartoon, what is the common object of learning? Maybe it is the blindfold, to begin with, the shared object that is, at first, not even recognized as such. Step One is discovering the object -- which, by the way, is utterly arbitrary, we don't even know who put them there, why, how, when, and with their hands free. They don't like the object, despise it in one case, disregard it in the others, but pay no attention to it once it is off. The shared object then becomes the room itself.
Maybe the shared object at first is just the other bodies, the people in the room. The first verification is just the mutual recognition of presence. The next step is the discovery of the unseen, unseeable, object, through the luck of a loose fit, or perhaps of a lucky jostle...