Correggio's public reputation rests on his illusionistic ceiling painting, above all the dome of Parma Cathedral and the cupola of San Giovanni Evangelista, where he opened the architecture upward into swirling visions of saints and angels seen from directly below, a technique called di sotto in su that later Baroque ceiling painters would take as their model^[1][4]. Alongside this public, architectural work, Correggio maintained a separate, quieter practice: small devotional panels of the Madonna and Child made for private patrons, worked at a domestic scale and meant for close, personal viewing rather than the crowded nave of a church^[1]. The two bodies of work share a technical signature, the soft transitions of light and shadow that made Correggio's figures seem to glow from within, but they serve entirely different functions and different audiences.

Correggio worked out his handling of light and shade by studying, at some remove, the innovations of Leonardo da Vinci, whose pupils were active in the cities near Parma where Correggio had opportunity to see their work^[1]. Leonardo had advised painters to study the faces of women in the softened illumination of twilight, and had worked out scientifically how light passes around a curved form; Correggio took that geometry and applied it to flesh, producing an effect one modern critic described as light passing over a surface like a stroking hand^[2]. The result, especially visible in his mythological nudes but equally present in his religious Madonnas, is a modelling without hard edges, colour and shadow doing the work that outline had done for earlier painters.

Writers on Correggio, from his own century onward, have returned repeatedly to a particular quality in his work that they call feminine or graceful, a tenderness that softens even his most martial or ascetic subjects^[2]. One art historian, Bernard Berenson, is quoted as saying that no painter was ever more penetrated by femininity, so that his warlike saints appear tender and his hermit saints move with a girl's grace^[2]. This quality, whatever one makes of the gendered language used to describe it, is the through-line that connects Correggio's public ceiling frescoes to his small private Madonnas: the same soft, glowing treatment of a face or a curve of drapery, whether the setting is a church dome sixty feet up or a panel meant to be held close.