Stefan Diez had to rethink sofa construction to create Italian brand Magis's Costume system, which is easy to take apart, recycle and clean.

Conventional sofas are typically difficult or impossible to separate into their component parts, preventing recycling and repair.

But Diez and Magis came up with a new construction method for Costume that does not involve its constituent elements being permanently fused together, while most of the materials can be recycled.

The Costume sofa is designed to be dismantled, recycled and easily cleaned

"We set out together with Magis to develop a sofa system that could be completely dismantled, with as little polyurethane foam as possible and a textile cover that is washable and can be replaced," said Diez.

The resulting product has a polyethylene structure made from recycled industrial waste that is itself further recyclable. Cushioning is provided by a pocket spring core and a thin layer of foam, which are held in place by a fabric cover with elastic loops that hook into the sofa's base.

Sofa modules are joined by connectors in either matching or contrasting colours

The system has just four modules — a seat, left and right armrest, and an ottoman. This allows it to be assembled into various configurations and easily rearranged to suit different spaces.

Costume is available in a range of fabrics, with plastic module connectors in either matching or contrasting colours.