E=mc² is a clean and simple formula because it effectively expresses the equivalence between mass and energy, with the c² term ensuring dimensional consistency. The squared term arises from the need to fit the units correctly, and while it could theoretically be simplified with different units, the current form is widely accepted in physics. The discussion highlights that the formula does not account for the energy required to convert mass into energy; it merely represents mass as energy. Modern interpretations suggest that rest mass is a deformation of the Higgs field, with energy transfer involving complex interactions within spatial fields. Ultimately, the elegance of E=mc² lies in its foundational role in understanding the relationship between mass and energy in the universe.