In Catalonia, Spain, communities gather to build "castells"—astounding human towers that can reach up to ten levels high. This 200-year-old tradition requires hundreds of participants. Stronger, heavier members form the base, while agile children climb to the very top to raise their hand. Representing teamwork and community trust, the tradition is recognized by UNESCO as a Masterpiece of the Oral and Intangible Heritage of Humanity.
From Religious Folk Dance to Skyward Rivalry
The tradition of building human towers, or castells, has its earliest recorded roots in the southern part of Catalonia and neighboring regions during the late eighteenth century. The practice evolved directly from the Ball dels Valencians, a traditional religious folk dance that concluded with the construction of modest human structures. Over time, communities in the town of Valls, located near Tarragona, began focusing less on the choreography of the dance and more on the height and complexity of the final human tower itself.
By the early nineteenth century, these structures had detached entirely from their theatrical origins to become an independent athletic and cultural pursuit. Rival teams, known as colles castelleres, formed in Valls and soon began traveling to local town festivals across Catalonia to perform. This period established a spirit of friendly rivalry and regional pride that transformed what was once a localized spectacle into a widespread symbol of Catalan civic identity.
The Anatomy of a Human Structure
A completed castell is an intricate feat of organic engineering divided into distinct, interdependent zones. At the very bottom sits the pinya, a massive, densely packed ring of participants standing on the ground. The pinya acts as the physical foundation of the tower, bracing the legs and backs of the performers on the first elevated level while dispersing downward weight. Crucially, it also acts as a safety cushion to break the descent of upper climbers in the event of a collapse.
For exceptionally tall or structurally demanding constructions—such as those reaching eight, nine, or ten levels—builders add reinforced sub-bases above the pinya. The folre is a second-tier base resting on the shoulders of the pinya, providing extra stability to the lower levels of the central column. For the most extreme ten-story towers, an additional third-tier base called the manilles is placed directly on top of the folre. Above these massive supporting tiers rises the tronc, or trunk, which consists of the vertical column of levels, each typically made up of two to five individuals standing on the shoulders of the tier below them.
The Crown and the Decisive Signal
The highest part of the tower is known as the pom de dalt, or upper crown, and is composed entirely of children chosen for their agility, lightness, and courage. The first layer of the crown consists of the dosos, two young climbers who face each other and grasp shoulders. Above them climbs the acotxador (sometimes called the aixecador), who crouches across the shoulders of the dosos to create a secure, compact platform at the apex.
The final participant to ascend is the enxaneta. This child climbs over the entire structure, strides across the back of the acotxador, and momentarily raises one hand with four fingers extended in a gesture known as fer l'aleta. This fleeting motion officially marks the completion of the tower's assembly, a state known as carregat. However, a castell is not considered a complete triumph (descarregat) until all participants safely and methodically climb back down without the structure collapsing.
The Guiding Rhythm of the Gralla
Because human towers are dynamic and fragile, communication between participants is critical, yet those at the bottom of the dense pinya cannot look upward or hear verbal commands over the roar of the crowd. To solve this, every performance is accompanied by traditional musicians playing the gralla, a high-pitched double-reed woodwind instrument, alongside a percussionist playing the timbal.
The musicians perform a specific melody called the Toc de Castells. The tempo and musical phrases shift precisely to reflect each stage of the construction. Distinct melodies signal when the base is locked, when the upper climbers begin their ascent, the exact moment the enxaneta raises their hand, and the progress of the dismantling phase. By listening to the music, the hundreds of people locked inside the base know exactly what is happening overhead and can brace their muscles accordingly.
The Four Virtues and Traditional Attire
The philosophy underpinning all castell construction is summarized in a traditional motto: 'Força, equilibri, valor i seny'—meaning strength, balance, courage, and good sense or prudence. Strength is required from the base members holding immense weight; balance belongs to the climbers scaling narrow human ledges; courage is demanded of the children who ascend to the peak; and good sense guides the technical planning, discipline, and caution necessary to avoid catastrophic injuries.
The uniform worn by castellers is specifically adapted to the physical demands of the sport. Members wear white trousers and a collared button-down shirt bearing their colla's distinctive team color. Crucial to the outfit is the faixa, a long black sash wrapped tightly multiple times around the waist. The faixa serves a dual purpose: it provides critical lumbar support to protect the lower spine from severe compression, and its folds serve as firm footholds and handgrips for climbers moving up the body of the tower. Climbers in the upper trunk perform barefoot to maximize grip and avoid injuring the shoulders of their teammates.
Modern Evolution and Universal Inclusion
In the late twentieth century, castells underwent a profound renaissance marked by social and technical changes. Historically an almost exclusively male pursuit, the modern era saw the widespread entry of women into colles castelleres. The inclusion of women revolutionized the architecture of towers: lighter, highly athletic female climbers allowed teams to construct significantly taller and more stable structures, paving the way for the historic construction of nine- and ten-tier towers that had rarely or never been achieved in earlier centuries.
Safety measures also advanced alongside technical ambition. Following biomechanical studies on falls, specially designed protective foam helmets were introduced for the young children forming the pom de dalt, dramatically reducing the risk of severe head trauma. Today, colles are radically inclusive, bringing together individuals across all ages, genders, and social backgrounds. In recognition of its deep community roots, structural complexity, and transmission across generations, UNESCO inscribed castells on the Representative List of the Intangible Cultural Heritage of Humanity in 2010.
Key takeaways
•Castells originated in the late eighteenth century in Valls, Catalonia, developing from the concluding human towers of the traditional Ball dels Valencians folk dance.
•A completed tower requires specialized architectural tiers, including a ground-level base (pinya), optional intermediate reinforcement tiers (folre and manilles), a central trunk (tronc), and a child-led summit (pom de dalt).
•Performances are synchronized by the Toc de Castells, played on the gralla and timbal, allowing blind-folded base participants to track the tower's assembly by sound alone.
•The modern era transformed the tradition through the integration of women, the introduction of safety helmets for young climbers, and formal recognition by UNESCO in 2010.