Water, earth and air

[eggyk]

This subject was discussed many times... Astrology associations signs - planets - elements are clearly represented by symbols in manuscripts as in the Saturn image posted by eggyk.

Biblical creation drawings in manuscripts also symbolize the air element with a cloudband.
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The astrological symbols for planets and elements were adopted late in the 15th century in printed astronomy books.

In Sacrobosco's De Sphaera manuscripts the spheres were named but drawn without symbols but in some later printed editions the symbols are clearly drawn, for example in the You are not allowed to view links. Register or Login to view..

Just to clear up what I meant initially, I wasn't saying that the pattern always means a boundary, nor that it never means air, but I don't believe that the pattern in that saturn image represents the element of air. 

As the voynich portal article says: 

So this infurled style of band is frequently used to represent a division between realms (usually heaven and earth), but it can also represent “air”.