Matthias Grünewald's Isenheim Altarpiece (1512-1516, Musée d'Unterlinden, Colmar) is the most emotionally extreme work of Northern Renaissance painting and, for many who encounter it, the most spiritually powerful work of art ever made. Created for the Antonite monastery hospital at Isenheim in Alsace - an institution that specialized in treating ergotism, a gangrenous skin disease caused by infected grain that produced blackened, putrefying flesh - the altarpiece placed a visibly diseased Christ on the cross before patients who were themselves suffering similar bodily destruction.
The central crucifixion panel, visible when the altarpiece is fully closed, shows Christ's body covered with the open sores, blackened skin, and swollen joints of ergotism - the disease his audience suffered. This was not naturalistic representation for its own sake but deliberate pastoral theology: the suffering Christ was being shown to the suffering patient as one who knows their suffering from the inside. Isaiah 53:4 - 'Surely he took up our pain and bore our suffering' - was being made visually specific to the exact form of pain that these patients endured. The cross was not distant but present in every infected wound.
The altarpiece was a polyptych designed to open progressively, with each configuration revealing a different visual register. Closed: the devastating crucifixion, with the darkness of judgment and death, the green-grey flesh of the dead Christ, the fainting Virgin, and John the Baptist pointing at the body with the words from John 3:30 ('He must increase, but I must decrease'). First opening: a radiant Annunciation, a blinding Nativity, and a transcendent Resurrection - the darkness flooded with light, the dead Christ's body now luminous and ascending, the soldiers around the empty tomb literally flung backward by the light. Second opening: the sculpted figures of the saints at center, the painted scenes of Anthony on the outer wings.
The movement from darkness to light across the successive openings is a visual theology of the Christian life: suffering, death, and darkness are not the end but the passage through which resurrection and glory arrive. The patient lying in agony in the hospital ward, looking up at the closed altarpiece, saw Christ's diseased body. When the altarpiece opened for the feast day, the same patient saw the risen Christ blazing with light. The message was direct: your suffering does not contradict your hope; it participates in the suffering of Christ who was raised.
Grünewald's work fell into obscurity after the Reformation and was rediscovered in the 20th century by artists and theologians who found in its unflinching darkness a resource for confronting the suffering of modernity. Albert Schweitzer wrote about it, Karl Barth placed a reproduction of the crucifixion panel above his desk, and Matthias Grünewald became - nearly four centuries after his death - one of the most influential artists for the modern theological imagination. Paul Hindemith's opera Mathis der Maler (1938) took the Isenheim Altarpiece as its subject, placing the suffering artist in the tradition of the suffering Christ as the proper response to political violence.
The altarpiece remains in Colmar, in a museum purpose-built for its housing, and its effect on visitors - many of whom travel specifically to see it - suggests that five centuries have not diminished its capacity to place the viewer inside the experience of suffering and hope that it was made to address.