After a long absence from the stage, pianist Vladimir Horowitz was to perform in Chicago. Franz Mohr, the chief concert technician for Steinway and Sons, was assigned to make sure the piano was in perfect condition. He did so to the best of his ability, but wasnt able to relax until Horowitz had given a brilliant rendering of his first number. As was his custom, the pianist left the stagebut didnt return. Mohr was summoned backstage. “Where have you been?” exclaimed Horowitz. “I cannot play again. The piano stool is far too high!” Mohr nervously inquired at to the size of the problem. Horowitz held up his hand, his thumb and forefinger about a quarter of an inch apart.