By observing a black swan, one ascertains an interesting zoological fact. The fact involves two items, a specific object and the property of being a black swan, and consists in the former instantiating the latter. The object is in itself of little interest. Our environment abounds in objects, and knowledge is hardly enhanced by one of them being merely picked out for consideration. The same goes for the property. Properties are at least as plentiful as objects and one does not get to know anything by merely focussing attention upon one of them. What is of interest is the combination of the two items, i.e. the circumstance that the object instantiates the property. And this is what the said fact consists in.