Why Sala delle Asse matters.
Sala delle Asse is an enveloping Renaissance chamber where Castello Sforzesco's ducal character meets Leonardo da Vinci's botanical observation, Ludovico il Moro's political imagery and an illusionistic arbor conceived across an entire architectural interior.
Set within the northeastern corner of Castello Sforzesco's Corte Ducale near the Torre Falconiera and just steps from the Cortile della Rocchetta, the chamber occupies the ground floor of a fortified palace precinct where brick arcades, defensive towers, enclosed courts and the layered residential wings of the Sforza stronghold surround a rectangular room once embedded within the duke's private ceremonial world. Painted trunks rise from the walls toward a vaulted ceiling where dense foliage and interlaced cords dissolve the architectural boundary overhead. Mulberry branches gather into an immense artificial canopy around heraldic shields and inscribed cartouches, converting the closed chamber into a painted arbor. The northern walls descend into Leonardo's Monochrome, where immense roots penetrate fractured rock and extend the arboreal scheme from the vault toward the former fireplace. The result is a room in which architecture nearly disappears beneath a court commission that joined botanical scrutiny, illusion and dynastic imagery at the end of Ludovico Sforza's rule.
What defines Sala delle Asse.
Sala delle Asse is best known for Leonardo da Vinci's 1498 transformation of a large chamber in Ludovico il Moro's Castello Sforzesco into an illusionistic arbor of mulberry trees, intertwined branches and golden cords. Gualtiero da Bascapè, Ludovico's secretary, wrote to the duke on April 21, 1498 that the wooden boards covering the chamber were to be removed and that Leonardo had promised to finish his work by September. Another letter two days later confirmed that the boards had been taken down, establishing the immediate architectural preparation for Leonardo's intervention. The scheme sent great trunks upward from the walls into a dense canopy spreading across the vault, with intertwined cords forming elaborate knots among the foliage. The mulberry carried an unusually precise relationship with the patron: moro and the Lombard morone connected the tree with Ludovico's epithet, as mulberry cultivation simultaneously supported Lombardy's silk industry under his government. Luca Pacioli called the room the camera detta de' moroni in the 1509 Divina Proportione, preserving its association with the trees long after Sforza rule had collapsed. Heraldic and political imagery strengthened the connection to Ludovico. Cartouches commemorated Bianca Maria Sforza's marriage to Emperor Maximilian, Ludovico's ducal investiture in 1495 and his 1496 journey with Beatrice d'Este to seek Maximilian's assistance during the conflict with Charles VIII; the central shield combined the Sforza and Este arms. The French conquest of Milan in 1499 brought Ludovico's court to an abrupt end and interrupted the environment Leonardo had created within the castle. The chamber survives at the intersection of Leonardo's final Sforza commissions and the political collapse that ended his first Milanese period.
The Monochrome and the room's modern conservation history expose a separate chapter hidden beneath centuries of military occupation, limewash and earlier intervention. Leonardo's preparatory work on the northern walls depicts immense mulberry roots entering the earth, forcing apart squared rocks and extending through undergrowth containing carefully observed plants including cuckoo-pint and bearded iris. Charcoal established the drawing before ocher pigments applied with a brush developed its chiaroscuro, and the composition originally framed the opening of the chamber's great fireplace. Foreign governments subsequently converted Castello Sforzesco into military quarters, and repeated applications of lime concealed the Renaissance decoration. Paul Müller-Walde's investigations and Luca Beltrami's castle campaign brought the painted scheme back to attention near the end of the nineteenth century. Ernesto Rusca reconstructed the polychrome vault and lunettes between 1893 and 1902 under Beltrami's direction, producing the vivid version that shaped early modern understanding of the room. Ottemi della Rotta reduced portions of Rusca's intervention during work in the 1950s, when the Monochrome was fully exposed and BBPR incorporated it into their new museum installation. Conservation begun in 2013 uncovered further preparatory trunks, branches, foliage and distant landscape across the walls, expanding the known scope of Leonardo's original conception far below the celebrated canopy. The restored Monochrome reopened temporarily for Expo 2015, followed by the 2019 Leonardo mai visto presentation after six years of investigation. A further conservation campaign is now addressing the fifteenth-century painted surfaces, and the Sala delle Asse remains closed to ordinary public access during the work.
How Sala delle Asse fits.
Sala delle Asse works as the anchor for a daytime exploration west of Castello Sforzesco through three nearby sites that move from an early medieval female monastery through Milanese Baroque political power into the architectural legacy of the 1906 International Exposition.
Begin at San Maurizio al Monastero Maggiore, attached to the female Benedictine house established between the eighth and ninth centuries within an area containing substantial remains of Roman Milan. The monastery absorbed a polygonal tower belonging to the late Roman defensive wall and a quadrangular tower from the imperial circus, allowing both structures to survive through centuries of religious occupation. Reconstruction of the church began with the first stone on May 20, 1503 and created separate halls for the congregation and enclosed nuns. Ippolita Sforza and Alessandro Bentivoglio became principal patrons of the sixteenth-century painted campaign, joined across successive phases by Bernardino Luini and his workshop, Giovanni Antonio Boltraffio, Vincenzo Foppa, the Campi brothers and Simone Peterzano. Suppression in 1798 ended the Benedictine institution, and partial demolition between 1864 and 1872 opened Via Luini and Via Ansperto through the former complex. Continue to Palazzo Litta, commissioned by Bartolomeo Arese from Francesco Maria Richini and constructed between 1642 and 1648 as the residence of a figure who became President of the Senate in 1660. Margherita Arese inherited the palace in 1674 through her marriage to Fabio III Visconti Borromeo Arese, and the property later passed to the Litta family as its interiors acquired their eighteenth-century character. Carlo Giuseppe Merlo created the ceremonial scissor staircase leading toward the piano nobile, where Giovanni Antonio Cucchi contributed Rococo painting. Bartolomeo Bolli completed the vivacious Corso Magenta facade in 1761, arranging colossal pilasters, an immense portal, paired telamons and the Litta arms across a frontage that concealed Richini's earlier courtyard behind it. Conclude at Acquario Civico, designed by Sebastiano Locati as a pavilion for the 1906 International Exposition celebrating completion of the Simplon Tunnel. The exhibition spread through the grounds behind Castello Sforzesco and into Piazza d'Armi, using temporary architecture to present industry, transport, decorative arts and scientific advancement on an international scale. Locati's aquarium survived the dismantling that erased most exposition structures and passed to the Comune after the event. Its Viennese Liberty architecture preserved a rare permanent fragment of the fair, followed a century later by a major renovation completed in 2006 that reorganized the interior around aquatic environments extending from Alpine sources toward the sea. The progression moves from Monastero Maggiore's absorption of Roman structures through Arese and Litta patronage into Locati's surviving exposition pavilion, carrying the outing across three distinct episodes in which inherited urban ground acquired radically new cultural purposes.
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