system
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human
Hey /omg/!
I am trying to design a simple western meditation system, nothing crazy it's just something for me to do daily and it's based, atleast superficially, on alchemy.
I use the three alchemical principles as a base, salt corresponds to the body so i've organized a few postures, the 4 'western postures' (standing, lying,sitting and kneeling), as they are called by people like Gareth Knight, and two i got from egyptian art, the scribe position (from egyptian statues of scribes, it's was also a normal way to sit for people in the middle east) and the fetus position you can sometimes see too.
Mercury, according to some Golden Dawn alchemical texts, corresponds to or can even be considered the Hindu Prana (breath), it also corresponds to the Christian Soul and Jewish Ruach, i did not think of any breath exercises as i believe discipline of mind to be sufficient to learn; the 'mercurial exercises' i divide into 3 categories:
Thought Observation, just observing your mind without interfering which slowly slowly thought down
Thought Control, the concious effort of controlling the mind through visualization or just contemplation of a specific topic.
Thought Eradication, the most difficult of the three where you stop every single one of your thoughts.
For Sulphur, Spirit, i can't think of anything, maybe it's the state of deep concentration one can achieve through meditation? 'When the Sun and Moon meet' in an mystical way of expressing it.

What does /omg/ think of what i designed here? Should i go through with it, what could i add or change or remove?
gpt
Don't really have insight about what position and meditations to suggest, but do have some observation of what I understand is happening during with other schools ritual.
They all have different positions to place your body in with associates prayers/mantas, breathing patterns, and specific movements. 
All of those factors work together to create a certain frame of mind/mind space (or whatever term you prefer) and many use this as the starting point to explain a perspective.
The different positions and rituals also have an aspect of hierarchy based of of understanding and/or achievement in the school.
My suggestion set a starting point, define the end point and map the journey. Than create the position and rituals to act as sign post along the path.
Good luck.