The Kabbalah teaches various associations between parts of the soul and our body’s organs.
In several places the Tikunay Zohar relates the lowest part of the soul, Nefesh, to our heart and its hot passions, presented in this poster in red with triangular Shins that represent Fire. The next higher part of the soul, Ruah, is related to our lungs and how they rise and fall with our breath, presented here in yellow with round Alephs that represent Air. The next higher part of the soul, Neshamah, relates to the brain and its cool reason, presented here in blue with rectangular Mems that represent Water.

The Tikunay Zohar teaches that if not for our lungs that breathe upon our hearts cool Air that it brings down from our brain, the fiery passions of our heart would consume our entire body.