Idea for senior project

an idea that i have for my senior project was to do a photo essay on the golden ratio, i enjoy taking pictures and i think it would be a cool idea to have like 5 or so pictures all of the same type of math theme.

The Book of Numbers Chaper 0.000000001

Quote: "By then, a number was placed over another number without the horizontal line, to indicate a fraction. The line did not appear for another 600 years"
Comment: I never knew that fractions were just stacked numbers, I thought that was very interesting.
Question: If Pythagorean didn't create fractions, which one of his followers did?