Serpentine South has handed its building over to an artist who treats architecture as an instrument. 'Change Ringing', the first UK institutional exhibition by Tokyo-born artist Justin Caguiat, opened on 8 October 2026 in Kensington Gardens and runs to 10 January 2027, with free admission. The show brings together painting, sculpture, printmaking, sound and film in a site-responsive installation that uses the gallery's structure to frame and display the work. At the heart of the exhibition are thermochromic paintings that shift colour and reveal hidden forms as temperature and light change through the day, so no two visits look quite the same. Around them hang bronze bells cast in the delicate shapes of flowers and seeds, sounded in continually changing sequences by a continuous score composed by Lily Pickett. The music draws on the English tradition of change ringing, with code-driven pistons firing in sequence, and the gallery walls gather and amplify the chimes until the building itself becomes a listening instrument, an effect the artist links to the concrete acoustic mirrors once built along Britain's coast and to Le Corbusier's idea of architecture as an acoustic receiver. A new site-specific installation pushes the interaction further: thermochromic paintings on copper are wired to small heating pads that trigger when the bells ring, warming the panels and shifting their colours and forms in real time. Monumental mural-like paintings fill the main galleries, while a rarely used room at the back has been converted into a small cinema showing a 16mm film by the artist. The exhibition develops ideas from 'Zodiac Machine', Caguiat's project for Fundacion Sandretto Re Rebaudengo in Madrid earlier in 2026, and takes inspiration from the Spanish builder Justo Gallego Martinez, who spent decades constructing his Catedral de Justo almost single-handedly from recycled and found materials. Curated by Hans Ulrich Obrist and Natalia Grabowska with Alexa Chow, 'Change Ringing' considers how buildings accumulate memory, ritual and acts of transformation.