In classical literature, the term “permeable” was used with significant anatomical and physiological implications. For example, in “Galen: On the Natural Faculties,” Galen described the interventricular septum of the heart as permeable, suggesting that it allowed the passage of substances rather than serving as a complete barrier [1]. This usage reflects an early understanding of bodily functions, implying that even structures once thought to be solid might permit subtle flows essential to life.