Esteemed Almustafa, thank you for the response.
I suspected that it refers to the spinal column. However, it is written in the plural; this confused me.
Is it perhaps a typo? Or does it perhaps refer to the multidimensionality of the spinal column, because then it could make sense?
In the lecture you kindly posted, I could only find "columns" once, and then it referred to the spinal column in man and woman, thus plural. However, V.M.S.A.W speaks about columns in oneself.
Could you please clarify?