The back and armrests of the Stella Chair are made of spring steel – a flexible "low-alloy" steel with a high yield strength, which allows it to return to its original shape after bending or twisting – so that they flex in response to the user's movements.
The spring steel parts are clad in leather using traditional saddle-making techniques.
"The metal construction in the backrest is not very comfortable," Frey told Dezeen.
"I like the traditional saddle process because it reminds me of saddles for horses: precise, functional and strong. Plus leather plays wonderfully with wood."
The hand-turned wooden frame is available in oak, beech and walnut. The result is evocative of the Danish tradition – in particular Hans Wegner's Flagline Chair.
"The frame construction is traditional, but often chairs with this traditional construction seem static," Frey told Dezeen.
"My intention was to design a combination of a static frame with a dynamic backrest. The backrest not only seems dynamic - it is dynamic because of the spring steel inside."
Patrick Frey's previous projects include an outdoor chair made from curved and folded sheet aluminium, a collection of stools and benches each made of a single piece of folded plastic, and a range of wall-mounted boxes with hooks made from extended joints.