my dad thinks about cabbage

When I talked to my dad last night, he said that he was re-reading Spengler's "The Decline of the West" and how Spengler, among other things, wrote about the cosmological implications of the Greek number system with its totalities--between 1 and 3 there was only 2, no irrational numbers. he said it made him think about cabbage, and how if you peel off one cabbage leaf, it's still cabbage, if you peel off two leaves, it's still cabbage, so he was thinking about when cabbage stopped being a cabbage. apparently my mother, when presented with this query, responded that this happenned when all the leaves were peeled off until only the center remained. what is the name for the center of the cabbage anyway? in russian it's called "kocherizka." so i told him that he sounded like he was 16 and stoned, which is something i often say about myself. he thought it was hilarious. then he said he had been thinking about Achilles' heel (I guess because of the Greeks) and a poem by Voznesensky called Achilles' Heart, which he thought was a great title. So then we talked about Achilles for a while.