Barcelona has launched a major new exhibition to inaugurate its year as the UNESCO-UIA World Capital of Architecture 2026, inviting residents and visitors to reconsider the city through a unique mathematical lens: Barcelona = (Diversity + Intensity) x Complexity.
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The exhibition, housed in the former headquarters of the Gustavo Gili publishing house, is a cornerstone of a year-long programme celebrating the city’s architectural heritage and future. UNESCO and the International Union of Architects (UIA) awarded this designation, placing Barcelona at the centre of global discussions on urbanism and design throughout 2026.
Opening on Thursday and running until 13 December, the installation transforms the historic building into what curators describe as a “laboratory on the city,” aiming to break down common myths and foster a renewed appreciation for the intricate dynamics of urban life.
A Living Laboratory
The concept is the brainchild of Maria Buhigas, chief architect of the Barcelona City Council, who admitted to Catalan newspaper La Vanguardia that the three core themes are her “obsession.”
“The city is where we concentrate people and where problems are concentrated, it’s true; but cities make us better people,” Buhigas stated. “This is a hymn to optimism, in favour of cities.”
To bring this vision to life, a multidisciplinary team was assembled, including demographer Andreu Domingo, geographer Francesc Muñoz, and architects Eulàlia Gómez and Pau de Solà-Morales. The design studio Domestic Data Streamers, renowned for its innovative approach to data visualisation, was tasked with translating complex data into a tangible, engaging narrative.
Upon entry, visitors immediately become part of the experiment. An expansive “analogue survey” invites them to answer questions about their connection to Barcelona by weaving coloured threads across a large panel. The threads-yellow for those born in Barcelona, blue for newcomers-create a collective tapestry, visually recording public perception upon the exhibition’s conclusion.
Decoding the Urban Formula
The Diversity section uses measuring tapes and other physical objects to illustrate the city’s demographic fabric. It highlights Barcelona’s home to over 180 nationalities speaking nearly 300 languages, with a third of its 1.7 million residents born outside Spain. Anonymised mobile device data further reveals the city’s constant motion: over 2.6 million people-including residents, workers, and tourists-move through it daily. This data registers 5.43 million detections weekly in Plaça de Catalunya and 3.18 million at Sants Station.
Stacks of coloured bricks explore the concept of Intensity. Brown bricks represent residential space, while blue ones denote services and facilities. This simple yet effective method strikingly contrasts dense, mixed-use urban landscapes in districts like Eixample and Gràcia with the low-intensity, dispersed layouts of areas like Vallvidrera or the primarily residential blocks of Bellvitge in neighbouring L’Hospitalet. The display champions the compact city model as a more efficient way to provide collective resources, addressing a topic of ongoing debate in urban renewal projects across the city, such as the pedestrianisation of streets in Sants-Montjuïc.
Finally, interactive screens present Complexity, showing Barcelona as a network of interconnected systems. “We understand the city as a living being that adapts, that learns and improves,” curator Pau de Solà-Morales explained to La Vanguardia.
A Hymn to the City
While the exhibition doesn’t shy away from the challenges facing modern cities-including housing affordability, inequality, and the climate crisis-its message is ultimately one of confidence. First Deputy Mayor Laia Bonet emphasised this outlook, stating that cities must be the “spearhead of solutions” to these pressing issues.
“In a moment of polarisation like the one we are living through, knowing the environment we share and better understanding others has great value and and allows us to better imagine the future of the city,” Bonet remarked, as reported by Ara Cat.
By transforming abstract data into a shared, physical experience, the exhibition aims to fulfil its opening premise: “To try to understand the complexity of the city, one must begin by observing it.” For the next ten months, Barcelona is inviting the world to do just that.
