So you're talking about using the spiritual meanings of the elements?
Or perhaps "use what you can't see" is answered just by using the Elements/States we found to move onto the next clue...
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"Dig a little deeper into the "classical" elements and what they were often used for?"
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Something related to alchemy perhaps? Brewing? Or even witchcraft?
Use what we can't see... So we use the spiritual meanings of the elements to move on to our next clue? I.e. we can't see "air" for example, because in the pictures, there is no " travel, freedom, thought, ideas, intellect, imagination and discovery" - basically nothing that the "air" element stands for?