December 18 marks the United Nations' International Migrants Day, which aims to highlight the need for safer, fairer, and more inclusive migration systems. Proclaimed on December 4, 2000, the day seeks to recognize the multiple dimensions of migration beyond its economic and humanitarian aspects. According to the UN, mounting evidence indicates that international migration is beneficial for both countries of origin and destination. In this sense, International Migrants Day offers an opportunity to spotlight the value of the possibility to migrate and the contributions of millions of migrants worldwide to the cities and cultures in which they are integrated.

Aligned with this perspective, the UN's 2025 theme, "My Great Story: Cultures and Development," emphasizes how human mobility drives growth, enriches societies, and helps communities connect, adapt, and support one another. At the same time, International Migrants Day also acknowledges the increasingly complex environment in which migration occurs. Conflicts, climate-related disasters, and economic pressures continue to force millions of people from their homes in search of safety or opportunity. From both perspectives, it is essential to recognize the role of architecture in building integrated, multicultural communities and in responding to the conditions that lead people to migrate from their territories in the first place.

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Architectural space has long been framed by permanence: rooms for fixed functions, facades that clearly define where exterior ends and interior begins. Yet contemporary life is defined by overlap and transition: between work and living, interior and exterior, privacy and community. Spatial needs evolve continually, demanding architecture that can respond, adapt, and remain relevant over time. 

In this context, adaptability has emerged not only as a design ambition but as a sustainable necessity. Buildings that adjust to shifting uses, evolving climates, or new forms of living extend their lifespan and reduce the need for demolition or extensive retrofits. Flexibility becomes a measure of resilience, allowing structures to remain vital across decades. But how can architecture respond to the evolving ways we inhabit and experience space?

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Audience sightlines, accessibility and acoustics all make theater seating a hugely precise art. As part of their set of online resources for architects and designers, the team at Theatre Solutions Inc (TSI) have put together a catalog of 21 examples of theater seating layouts. Each layout is well detailed, with information on the number of seats, the floor seating area and row spacing. These layouts fall under three general forms; to supplement this information, alongside TSI's diagrams we've included the pros and cons of each type, as well as examples of projects which use each format. Read on for more.

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Recently, a new trend in architecture has emerged: Several of the latest projects highlighted by ArchDaily, including some winners in the Building of the Year Awards, are using permeable facades as an attractive option for their exterior finishes.

Better lighting, ventilation, and visibility are some of the advantages brought by this type of façades. Below is a selection of 15 images from prominent photographers such as Andrés Valbuena, Pedro Nuno Pacheco, and Koji Fuji Nacasa & Partners Inc.

Due to its ability to be shaped into complex forms and the diversity of textures that it can offer, concrete is one of the favorite materials of many architects, who appreciate its capacity to help them realize their designs. For this reason, for this week's Photos of the Week we have selected 20 images that highlight the beauty and expressiveness of this material. Read on to see a selection of renowned photographers such as Brigida González, Bruno Candiotto, Élena Marini Silvestri, and Raphael Olivier.

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