As the solstice marks the shortest day of the year in the Northern Hemisphere, it also draws attention to something architecture has long negotiated but often overlooked: time. Beyond form or function, buildings and spaces are continuously shaped by cycles of light and darkness, seasonal shifts, and environmental rhythms that affect how they are inhabited.

In recent years, a growing number of architectural projects have begun to work explicitly with these cycles. Rather than designing spaces to function in a single, fixed way, architects are creating environments that change throughout the day, across seasons, or in response to natural phenomena such as the sun's path, lunar phases, wind patterns, or circadian rhythms. These projects operate in dialogue with time, appearing, transforming, and activating differently depending on environmental conditions.

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The 2025 Osaka Expo has captured widespread attention—not only for its architectural ambition and spectacle, but also for breaking records and generating controversy. Its most iconic feature, a monumental timber ring designed by Sou Fujimoto, has already made headlines as a Guinness World Record-breaking wooden structure. Built on the reclaimed island of Yumeshima, the site has attracted praise and critique in equal measure. Beyond its awe-inspiring 2-kilometer circumference—parts of which extend dramatically over the water—the structure has also drawn concerns, including questions about health & safety, extreme heat, and swarms of insects that may affect the visitor experience.

This year also marks a significant anniversary: the 55th year since the 1970 Osaka Expo, held under drastically different socio-economic conditions. Comparing these two expos—both hosted in the same city—offers a rare opportunity to reflect on how the rhetoric, curatorial themes, and architectural ambitions of world expos have evolved over time. From "Progress and Harmony for Mankind" in 1970 to "Designing Future Society for Our Lives" in 2025, the shift in thematic focus reveals changing global priorities. Meanwhile, the scale and nature of architectural involvement have also transformed, from the futuristic visions of Japanese Metabolism to a more internationally dispersed group of designers concerned with sustainability, technology, and civic engagement.

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Renzo Piano Building Workshop, in collaboration with Betaplan Architects (Athens) and landscape architect Camille Muller (Paris), has broken ground on a new cultural center in Piraeus, the port of Athens. Commissioned by The Dinos and Lia Martinos Foundation (DLMF), the project seeks to establish an international hub connected to similar art centers abroad, open to the local community, students, and visitors, and contributing to the urban and cultural fabric of the Athens metropolitan area. The complex, called KYKLOS, is planned to host contemporary art collections and cultural programming with an international outlook. Initiated in 2023, the project is currently in development, with construction planned to extend through the last quarter of 2028.

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