It reminds me of the Talmud [1], particularly the oral Torah, with the commentaries attached.
On the inside (in purple in the image) we have the actual writing down of the Mishnah, a record of part of the oral Torah. Immediately underneath that is the Gemara, a key commentary/interpretation written around 200 AD. Surrounding that are the commentaries of rabbis who lived in the Middle Ages. And at the very edge in small print, there are commentaries from modern (1600s - 1800s) rabbis.
On the inside (in purple in the image) we have the actual writing down of the Mishnah, a record of part of the oral Torah. Immediately underneath that is the Gemara, a key commentary/interpretation written around 200 AD. Surrounding that are the commentaries of rabbis who lived in the Middle Ages. And at the very edge in small print, there are commentaries from modern (1600s - 1800s) rabbis.
[1] https://upload.wikimedia.org/wikipedia/commons/0/01/Labeled_...