During the Renaissance, painters frequently used to hide human anatomies inside their artworks. Piero della Francesca (1415–1492) in two paintings represents the infant Jesus with a necklace of coral beads, symbol of beauty and tool for protection against illness or sudden death. Interestingly, the shape of both coral pendants follows a scheme similar to the primary and secondary divisions of the lower respiratory system with the trachea, the main and the lobar bronchi. The numerous and surprising analogies between the coral and …