But they are where the great power of the number nine lies. For the number nine is one less than the base, 9 = 10-1. And because of that, it is the seed of many interesting patterns that all rely on having fallen short of the glory of ten.
Some people marvel at this. I don't. I think it's more wonderful to see that 1/7 is 0.142857…. See? Six repeating digits gained by doing a reciprocal on seven.
But nine is nice; it is three by three, and the nearest thing we have to numinosity in the palm of our hands.