convert armchair

Minimalistic design of the Convert modular seating system provides many possibilities for arranging various compositions.


Convert armchair | By SMPDO

The Convert armchair is a part of the Convert collection that distinguishes itself by a variety of combinations of arranging compositions in space and structural flexibility thanks to which it can be modified in time. Changing the positions of seating modules, fixed backrests, or the ones with a mechanism and platform for storage, offers a variety of different possibilities applicable both for households and public spaces. Essentially discreet in its shape, through the disposition of structural elements, selection of material, and several types of cushions, the system changes its character and function depending on the user’s preference.

Technical info
Suspensionelastic webbing
Seat & backrestHR foam, polyester wadding
Basemetal + powder coating / inox legs + powder coating metal construction galvanised + powder coating
Upholsteryfabric, leather (removable) / waterproof fabric (removable)


Prostoria Convert collection is made to order. Lead times 14-16 weeks.




Founded in 2013, SMPDO is a Zagreb-based industrial design agency working on various projects ranging from industrial and spatial design to site-specific installations, art direction, and design consultancy. Their work has been published in several renowned magazines (Dezeen, Domus, Frame, Hypebeast…) and exhibited worldwide.

The office has been awarded some of the most prestigious prizes – German Brand Award 2021, the German Design Award 2017, Red Dot 2013 and 2015, and Interior Innovation Award 2015. In the year 2014, SMPDO was a part of the team that designed the Croatian pavilion at the Venice Architecture Biennale. His work has been published in several renowned magazines (Wallpaper*, Dezeen, Domus, Frame, Hypebeast…) and exhibited worldwide.

Their designs for Prostoria include the Strain collection, Rhomb collection, and the Convert modular system.


We tend to perceive furniture as something abstract, created on designers’ desks and then produced, branded, and placed on the market by companies with different statuses and reputations. In fact, relations inside the contemporary globalized furniture industry are becoming more and more fragmented with less and less opportunity for complete dedication to synergies and collaborations… Prostoria, as a young company whose catalog already comprises some new icons such as the Polygon armchair and the Revolve transformable sofa, stands as an example of a different and more traditional approach based on the evolution from the local factuality and logical clustering of all actors involved in the production process.

The rapid development of Prostoria, formerly known as Kvadra, a company which has come a long way, from “starting from zero” to positioning itself as the leader and promoter of new ideas in only a few years’ time, is a story about the reintroduction of continuity both in Croatia and Central Europe, a region with vital but insufficiently recognized design scene and remarkable tradition and knowledge of the furniture industry. Those elements served as latent potentials that provided grounds for continuation and had to be activated.

Since the beginning, Prostoria has been developing an integrative approach, functioning as a collaboration platform that nourishes and stimulates a continuous exchange of knowledge and experience between all the actors participating in the production of furniture. A dynamic workshop ambiance has been created offering opportunities for designers to explore their ideas in excellent conditions and bring them to the highest level of design, functionality, and technological artisanship. Many products have been developed over long periods of time surpassing a number of iterations until reaching their final form, which would be impossible without adequate support combining contemporary technology and meticulous craftsmanship and handwork of the highest quality. Predominantly local materials are used, especially solid wood, and most of the production takes place within the company itself or in collaboration with local cooperatives.

While the company’s catalog also offers furniture based on tested models, Prostoria shows strategic and even passionate dedication to research-based design, convinced that authenticity has its place on the market but presents a special challenge in times when it seems almost impossible to create truly innovative and fresh concepts. For that reason, Prostoria’s social responsibility and specific position have to be observed as a contribution to the evolution of design and readiness to take risks in order to reach new values for the benefit of users and the culture. Thus, Prostoria stands as a project inside which designers grow together with the company on the grounds of mutual trust and shared goals.