When we get into composite numbers, I think it would be clearer to have them split the "other" way, e.g. to have 6 split into 3 and then 2 on the outside, showing that it's the same "shape" as the 3 identity, but that it's an octave higher, so each piece is just split up into two. Ditto 10=5 x 2, 12=3 x 2 x 2, 14=7 x 2. This means they'd keep the same shape going all the way down the gold axes, so one could easily recognise they were like "copies of the same thing"
When we get to composite numbers not involving two, then I guess you have the biggest factor on the inside, and the smallest on the outside. So 9 is fine how it is, but 15 might be better as 5 and then 3.
When we get into composite numbers, I think it would be clearer to have them split the "other" way, e.g. to have 6 split into 3 and then 2 on the outside, showing that it's the same "shape" as the 3 identity, but that it's an octave higher, so each piece is just split up into two. Ditto 10=5 x 2, 12=3 x 2 x 2, 14=7 x 2. This means they'd keep the same shape going all the way down the gold axes, so one could easily recognise they were like "copies of the same thing"
When we get to composite numbers not involving two, then I guess you have the biggest factor on the inside, and the smallest on the outside. So 9 is fine how it is, but 15 might be better as 5 and then 3.