Geometric and Electronic Properties of Porphyrin: The Complex and Symmetrical Molecules Giving Color to Life⸻ 1. Introduction: Porphyrin as the Chromatic Architect of LifePorphyrins are the alchemical blossoms of biochemistry—living mandalas composed of four pyrrole petals, each conjoined by methine stems to form a symmetrical macrocyclic flower. This cyclic tetrapyrrole structure lies at the root of life’s chromatic and energetic architectures. Found at the core of chlorophyll, hemoglobin, cyto