Isenheim Altarpiece

Close-up look

Nine scenes folded into a single frame

The Isenheim Altarpiece is not a single painting but a folding structure of limewood panels several metres tall: nine painted scenes and a carved sculptural core are joined into a movable body that opens in three different ways. Closed, the viewer sees the Crucifixion: Christ's body fills nearly the whole height of the panel and is plainly larger than the figures beside him — a deliberate break with realistic scale, meant to show meaning rather than physical proportion. His skin is covered in greenish-grey blotches, open sores, and splinters lodged in the wounds; his fingers are cramped, his feet twisted, his lips blue. On the left, Mary collapses into the arms of John the Evangelist while Mary Magdalene wrings her hands in grief; a skull lies at the foot of the cross. On the right stands John the Baptist with an open book and a long pointing finger, next to a Latin inscription: 'Illum oportet crescere, me autem minui' ('He must increase, but I must decrease'). A small lamb at his feet carries a cross and bleeds into a chalice — a direct reference to the liturgy once celebrated before this very image. The Crucifixion itself occupies a central panel roughly 2.69 by 3.07 metres, the side wings stand just over two metres tall, and the predella below carries a separate horizontal Lamentation, Christ's body laid on a white shroud among the same mourning figures.

Opening the wings once removes that grim scene and reveals the Annunciation alongside an Angelic Concert and Nativity, flooded with a yellow light so intense that twentieth-century art historians first assumed the panel had been overpainted at a later date — it had not: Grünewald really did layer his pigments that densely. Further along comes an explosive Resurrection, Christ's body rising in a swirl of red and yellow light, his white shroud turning into a trailing streak of colour while the guards below fall backward, blinded and baffled. Deeper inside the structure sits a carved core showing Saint Anthony flanked by Saints Augustine and Jerome, the work of a sculptor rather than a painter; the flanking wings show Anthony's meeting with the hermit Paul and his torment by demons — grotesque creatures with bird beaks, scaled skin, and swollen bellies. A sixteenth-century viewer saw each of these three states on its own, on its own day in the church calendar; today the Unterlinden Museum displays every panel at once, and seeing them the way they were meant to be seen takes some imagination.

Commission and makers

A hospital order, a carver, and a painter renamed by mistake

The commission came not from a bishop or a prince but from Guy Guers, preceptor of the Antonite monastery at Isenheim, a small village in Alsace where the order had run a hospital since the late thirteenth century for sufferers of St Anthony's Fire — severe ergot poisoning from contaminated rye that caused burning pain, convulsions, hallucinations, and gangrene of the limbs. The carved elements — the saints' figures and the altar cabinet — were made by the sculptor Niclaus of Haguenau, who also worked on Strasbourg Cathedral; the painted wings were made by a master the surviving documents call Mathis Gothart Nithart. The name 'Grünewald' was only attached to him in the seventeenth century, coined by the biographer Joachim von Sandrart, who confused the painter with an unrelated namesake — an error that stood for roughly four hundred years before archival research corrected it.

The work is usually dated to 1512–1516, though the exact chronology is still debated: it is not certain whether the panels were painted in one continuous run or with interruptions, nor how the tasks were divided between the workshop and the patron. Technically it is tempera and oil on limewood panels joined by an elaborate system of hinges, a construction the German tradition calls a Wandelaltar, or 'transforming altarpiece': two rows of movable wings fold and unfold independently, letting different scenes be shown on different days of the liturgical year. Judging by the clinical precision of the skin lesions shown — the blotches, sores, and fistulas — Grünewald most likely observed the Antonite hospital's patients directly rather than working from book models; that kind of accuracy in depicting disease was rare in European painting of the period and remains one of the altarpiece's most discussed features.

Origins and influences

German engraving, Netherlandish painting, and mystical visions

Colmar, where Grünewald worked, was the city of Martin Schongauer, an engraver whose thin, almost calligraphic lines shaped German printmaking at the end of the fifteenth century; the sharp contours and brittle, angular folds of drapery in the altarpiece betray familiarity with that engraving tradition, though a direct link to Schongauer's own workshop is not documented and remains a hypothesis among art historians. Just as visible is a Netherlandish trace: through Strasbourg and Cologne, works by Jan van Eyck and Rogier van der Weyden reached Alsace, bringing their attention to fabric texture and dense, jewel-like colour comparable to what van Eyck applied in the Arnolfini Portrait. Grünewald took up that northern discipline of painting but abandoned its restraint: where an Italian contemporary such as Leonardo, in the Mona Lisa, sought an ideal harmony of features, Grünewald pushed the depiction of flesh to the very edge of pain.

The altarpiece's carved section belongs to a separate, parallel tradition — the late Gothic wood-carving of the Upper Rhine, to which Niclaus of Haguenau, the altarpiece's other maker, also belonged; decades earlier, the same regional circle had included Nikolaus Gerhaert, whose expressive, almost nervous drapery set the visual language spoken by much of the era's sculpture. A textual source matters just as much: the altarpiece's more unusual iconographic choices — in particular the Nativity scene with its angelic concert and strange radiance — almost certainly derive from the Revelations of St Bridget of Sweden, a fourteenth-century mystical text widely read in German-speaking lands; her Sermo Angelicus in particular is considered the likely source for this scene. Not everything in the altarpiece traces back to a written or painted model, though — several of its visual solutions appear to be Grünewald's own invention, combining different traditions without deference to convention.

Provenance

From an Alsatian almshouse to a museum, by way of two wars

The altarpiece remained at Isenheim until the French Revolution. In 1792, when the Antonite monastery was dissolved, its panels and sculptures were moved to the Colmar branch of the public library for safekeeping; according to a widely repeated but imprecisely dated account, it was around this time that some of the wings were sawn lengthwise so the painted scenes could be displayed separately, as independent pictures — modern researchers treat this detail cautiously, since sources disagree on the exact year of the sawing. In 1852 the ensemble was installed in the former Dominican monastery of Unterlinden in Colmar; the museum essentially grew up around it, and the altarpiece remains its central exhibit.

After the Franco-Prussian War of 1870–1871, Alsace passed to Germany, and the altarpiece's formal jurisdiction changed with it, even though it physically stayed in Colmar. A more dramatic episode came in 1917, when German authorities moved the altarpiece to Munich, where it drew scenes of near-religious pilgrimage at the Alte Pinakothek and left a strong impression on Otto Dix, George Grosz, Max Beckmann, and Thomas Mann; after the war, in 1918–1919, the work returned to Colmar along with Alsace itself. During the Second World War the altarpiece was evacuated again, this time to the cellars of the Haut-Kœnigsbourg castle, hidden behind wooden beams, where American troops found it in 1945 before it went back to the Unterlinden. The most recent major restoration, led by Anthony Pontabry, ran from 2018 to 2022, and only began after public protest against an earlier, more contested cleaning programme.

Why it is remembered

From a forgotten master to an icon of Expressionism

For a long time the name of the altarpiece's real author stayed hidden behind the borrowed label 'Grünewald,' and the work itself was treated as a local Alsatian curiosity. That changed largely thanks to the French writer Joris-Karl Huysmans: his 1891 novel Là-Bas features a character obsessed with the sight of Grünewald's Crucifixion, and in 1904 Huysmans travelled to Colmar himself and devoted an essay to the altarpiece in his 1905 book Trois Primitifs — texts now considered among the sparks that returned Grünewald to art history at the turn of the twentieth century.

A genuine cult formed during and after the First World War: a Munich exhibition of 1917–1919, conceived as a patriotic gesture, unexpectedly turned the altarpiece into a source of inspiration for German Expressionists, above all Otto Dix and George Grosz, who painted the mutilated bodies of war veterans in a visual language borrowed from Grünewald. The composer Paul Hindemith answered with a symphony (1934) and the opera Mathis der Maler (1938), based on the painter's life; through the 1930s the altarpiece's reputation stayed oddly split — Nazi propaganda tried to claim it as an example of 'truly German' art, while the same regime branded Expressionism and Hindemith's music 'degenerate,' leaving Grünewald's legacy caught between the two verdicts.

In the second half of the twentieth century Francis Bacon drew directly on the altarpiece's imagery, carrying its bodily intensity into his own crucifixions stripped of religious content; a broader trace runs through Otto Dix and Georg Baselitz, both of whom openly called Grünewald a teacher in the art of deformation. Public interest has not faded today: in 2018 a restoration plan for the altarpiece triggered public protest sharp enough that the museum had to revise its methodology — a rare case of a late-medieval painting becoming the subject of open public argument.