No text, but a visual code

[HermesRevived]

 

The symbols certainly already existed. Perhaps not as we know them.
The example is from a dwelling cave. I age is estimated to be between 150 BC and 250 AC.

That's an interesting arrangement. If Aries is at 1 and Pisces at 12 then there is a contrast between the first half of the cycle and the second. The first half, from 1 to 6 (Aries to Virgo) is marked by  symbols with diagonal lines. The second half, from Libra to Pisces, is marked by horizontal (rectilinear) symbols. It's the difference between an X and a +. The exceptions are the two solstices, Cancer and Capricorn. It suggests that these symbols began with the binary division of the ecliptic such as the ascending and descending cycles.