Grigori
balenciaga said:So then one should think dust blowing on an empty plain?
I don't know. I tend to think of image like you've given more so for the Court cards where the elements are combined (So dust on an empty plane may make you think of Earth of Air and hence the Princess of Swords.)
For dignities I tend to break the Elements down to their more basic categories (Male, Female, Hot, Cold, Dry, Wet) and use that to compare cards. So for example the "Future" position may be Hot and Dry, while the "Goal" is Hot and Wet, but the "Environment" is Cold and Dry, so that tells you something about the story that is happening, or where problems might lie.
Its a different idea than what Teheuti explains in the thread I linked to, which seems to me to be based on the GD spread, or similar reading methods where each position has many cards and you need to decide which are applicable, so you use dignities to remove some cards from the equation.