Socrates was traveling to visit his friend Xeno, when he came to a fork in the road. At the fork was a man. "Dear fellow," said Socrates, "I seek the home of my friend, Xeno. Do you know where it is?" Without speaking a word, the man flung out an arm, pointing along the left fork of the road. Socrates took the left fork, because he then knew which way Xeno's home was. Soon enough, he arrived at Xeno's home, on the left fork. When Socrates related his journey to Xeno, Xeno said, "Socrates, the man you spoke to is a deaf, blind spastic. He simply hurls his arms out at random times and in random directions." So, at what point did Socrates actually know which fork in the road to take in order to get to Xeno's home?