A Baker cyst is swelling caused by fluid from the knee joint protruding to the back of the knee. Baker cysts are common and can be caused by virtually any
The accumulation of synovial fluids or the joint fluid results in the formation of a Baker's cyst behind the knee. a Baker's cyst at the back of the knee
From Hume's "Treatise of Human Nature."
It makes you think of how Hume concludes book one on Understanding in his "Treatise of Human Nature":
"I am afraighted and confounded with that forelorn solitude, in which I am plac'd in my philosophy, and fancy myself some strange uncouth monster, who not being able to mingle and unite in society, has been expell'd all human commerce, and left utterly abandon'd and disconsolate. Fain wou'd I run into the crowd for for shelter and warmth; but cannot prevail with mself to mix with such deformity. I call upon others to join me, in order to make a apart; but no one will hearken to me. Every one keeps at a distance, and dreams that storm, which beats upon me from every side. I have expos'd myself to the enmity of all metaphysicians, logicians, mathematicians, and even theologians; and can I wonder at the insults I must suffer? I have declar'd my dis-approbation of their systems; and can I be surpriz'd, if they shou'd express a hatred of mine and of my person? When I look abroad, I forsee on every side, dispute, contradiction, anger, calumny and detraction. When I turn my eye inward, I find nothing but doubt and ignorance. All the world conspires to oppose and contradict me ; tho' such is my weakness, that I feel all my opinions loosen and fall of themselves, then unsupported by the approbation of others. every step I take is with hesitation, and every new reflection makes me dream an error and absurdity in my reason."
I mention all that because the bizarre sense of absolute under-determinedness (i.e. skeptical uncertainty) with which you leave the reader in regards to the formation of sets.