Robotic Mosaic

Mosaic Façade Panel | Photo © Spyridon Pyrgiotis, Ioanna Tatouli

Research Project · ETH Zürich, CH · 2025

Robotic Mosaic explores a material-led workflow for transforming irregular ceramic waste into bespoke mosaic surfaces. Instead of forcing reclaimed tiles into a predetermined system, the process begins by perceiving and digitizing what is available. A vision-guided robotic setup identifies each tile’s shape, color, position, and orientation, creating a live material inventory that can evolve as new tiles are introduced.

Computational algorithms then translate this unpredictable collection into a coherent composition. Using color fields, directional vector fields, surface geometry, and signed distance functions, the system searches for viable positions for each individual tile while respecting its fixed shape and avoiding collisions. The result is not a mosaic generated from standardized digital elements, but a design negotiated between intention and material availability.

The workflow operates across both planar and free-form surfaces. On flat surfaces, automatic packing can be combined with manual decisions available through a Graphical User Interface. For three-dimensional architectural elements, a robotic arm first excavates and compacts an earth formwork. The tiles are then flipped, oriented, and embedded into the shaped earth before concrete is cast. Once the formwork is removed, the tiles become an integral mosaic finish within the concrete surface.

By connecting computer vision, computational design, and robotic fabrication, the project reframes waste as a source of possibility. Irregularity is not eliminated or standardized; it becomes an active part of the design process, enabling discarded materials to generate customized architectural surfaces.

Supervision
Prof. Dr. Benjamin Dillenburger
Project Team
Dominik Reisach (Project Co-Lead), Ming-Yang Wang (Project Co-Lead), Spyridon Pyrgiotis, Ioanna Tatouli, Megi Sinani, Sukhdevsinh Parmar
Workshop Support
Tobias Hartmann, Philippe Fleischmann, Luca Petrus, Jonathan Leu, Michael Lyrenmann, Matineh Mahmoudi (Concrete Recipe)
Material Sponsors
JOHO Baukeramik + Bäder AG, Ganz Baukeramik AG
Software
Python, OpenCV, YOLO11, SAM2, Rhino, Grasshopper
Hardware
ABB IRB1600, Intel RealSense D455f, Digging and Vacuum Gripping End Effectors
Graphical User Interface Prototype for Planar Mosaic Fabrication | Video © Dominik Reisach
Planar Mosaic Fabrication | Video © Dominik Reisach
Earth Formwork Fabrication | Video © Spyridon Pyrgiotis, Ioanna Tatouli
Mosaic Fabrication in Earth Formwork | Video © Spyridon Pyrgiotis, Ioanna Tatouli
Tile Flipping | Video © Spyridon Pyrgiotis, Ioanna Tatouli
Casting & Demolding | Video © Spyridon Pyrgiotis, Ioanna Tatouli
Mosaic Façade Panels | Photo © Spyridon Pyrgiotis, Ioanna Tatouli
© 2026 Dominik Reisach. All Rights Reserved.