The war went on; liberation in the north, liberation in the south, and in the fall of 1944 there was a lull. We moved back to Paris. Again I prefer to skip the main events in the summer, they are irrelevant, I think, to my story as a scientist. I was accepted by the Lycée Legrand (1944), which is the biggest, most prestigious high school in Paris, and took the exams as such, as a student of Lycée Legrand. But I didn't really attend the classes. The professor told us the exams of '44 had been postponed, again the world was very unstable, and we would take them in December and January. In December and January we took these absolutely hellish exams. You take the written paper for one exam, the written for the other and the oral of yet another. For a very long time I was doing nothing else except going from exam to exam. At one point, I was walking down the Latin Quarter and Monsieur Ponce, who was, I would say, my host and my teacher but really my host in that high school, hailed me in the street and said, "May I speak to you?", I answered "Yes, sir." "The examiners tell me that one student in my class did the math problem from end to end - in fact only one student in France did it and he's in my class. I don't understand it. I couldn't do it myself. And I know the students in my class, and not one of them could do it remotely. Did you do it?" I said, "Yes, sir, I did it." "How did you do this triple integral in the middle of the problem? It took me hours to get it." I said, "But that triple integral is the volume of a sphere if you don't work in x, y, z co-ordinates, but in u, v, w, which are natural to the problem." "Of course, of course, of course, of course, of course." So again, I'd gone through the moves of this terrifying exam by cheating. I didn't reduce that integral, I didn't think of cute ways of replacing this by that. I had no repertory of tricks of calculation, but I had an innate intimacy with shapes, and that whole problem, instead of doing it as a problem of calculation, I had done it as a problem of describing shapes.
