I’m relieved to see that even brilliant physicists make mistakes. Kohler looked over. What do you mean? Whoever wrote that note made a mistake. That column isn’t Ionic. Ionic columns are uniform in width. That one’s tapered. It’s Doric—the Greek counterpart. A common mistake. Kohler did not smile. The author meant it as a joke, Mr. Langdon. Ionic means containing ions—electrically charged particles. Most objects contain them.