I'm a little frustrated with the lack of discussion of frequencies in this article, which seems like a key bit of background to understanding this work. An "oct

I'm a little frustrated with the lack of discussion of frequencies in this article, which seems like a key bit of background to understanding this work. An "octave" is two sounds where one of them has exactly double the frequency of the other. I think it makes sense that octaves aren't hardwired, however it is fundamentally a mathematical property of frequencies. I'm not sure how I feel about the thesis; can children tell if something is twice the size of another or do you need the concept of "two?" I think like other people I initially found this a little unlikely because octaves are innate physical and mathematical properties, but there are tons of physical/mathematical properties that require a lot of study to understand intuitively.