Deformation of tectonic plates is rarely plane-strain. Instead, extensional thinning and crustal thickening are generally associated with lateral contraction and extension, respectively, i.e., triaxial deformation. Hallmarks of triaxial deformation are non-parallel and non-cylindrical structures, network of oblique slip faults, as well as conjugate fault sets. This project aims at unravelling the manifestation of triaxial deformation of the earth in tectonic structures. We choose an analogue modelling approach to account for the large-scale, three-dimensional character of the natural prototypes (e.g., the Basin and Range province, the Apennines, the Pamir and Himalaya, East Anatolia) and the high resolution required. We complement the analogue models with numerical models to cross-validate and extend the parameter space and observables (e.g. stress, volumetric strain).