Removing dents from a tuba - video

[nova_robotics]

Perhaps he had a high school level understanding of fractions - you know, "3/8 is bigger than 1/2 because 8 is bigger than 2"

Less sarcastically, perhaps each row is for a particular pipe size and all the ball sets were not acquired at the same time so the holder evolved rather than being designed for the complete ensemble.

I know you're an old fart, but I didn't think senility had set in just yet. Where are those rows you speak of there Marv? Maybe I don't have a high school understanding of fractions, but you don't appear to have a kindergartener's comprehension of drawing a straight line.