Atelier Tropisme Mécanique is an architecture and structural engineering firm founded by Thomas Motrieux and Antoine Sintes. With offices in both Lyon and Laval, it offers clients optimal project management. The firm designs sustainable and site-respectful projects, both as an architecture firm on programs ranging from housing to civil engineering structures, and as a structural engineering firm to support architects on projects with significant technical and structural challenges.

The agency's approach is characterized by a focus on contemporary construction challenges and an attempt to synthesize new design methods—parametric design, hybrid wood/concrete structures, and life cycle analysis—to ensure high-quality projects. It situates its work within the history of construction, placing the enduring principles of architecture—geography and gravity—at the heart of its thinking. It thus prioritizes local materials and construction techniques, exploring the relevant supply chains for each project, and is committed to reuse in all its forms.

Atelier Tropisme Mécanique draws on the dual expertise of architects and engineers to take a holistic approach to projects, addressing various challenges to unlock new potential. It is rooted in the belief that a simple and precise form can, in itself, encapsulate the increasing complexity of contemporary projects.