New York 2016: Finnish designer Janne Kyttanen has continued to develop his explosion welding technique, melding volcanic stone and 3D-printed copper into two furniture pieces (+ slideshow).

The new side table and shelf join his prow-shaped Metsidian table, unveiled at last year's Design Miami fair.

Explosion welding uses chemical explosives to bond materials that can't be joined through conventional welding.

"[These] are dynamic works that represent a moment in time — an eruption that melds two divergent materials together," said Kyttanen.

In Kyttanen's collection, volcanic obsidian is melded together with a 3D-printed copper grid to form the furniture pieces.

"The result is a compelling metamorphosis; the impossible becomes reality," he said. "Metsidian designs traverse the boundary between sculpture and furniture, a harmonious union of otherworldly form and everyday function."

Kyttanen is a digital sculptor who has been at the forefront of 3D printing technology together with the studio he founded, Freedom of Creation.

In 2015 he produced a 3D-printed sofa made of a minimal mesh, informed by spiderwebs and silkworm cocoons.

He also created a range of shoes that can be 3D printed overnight from a digital file at home and worn out the next day.

Alongside the new Metsidian pieces, Los Angeles-based Gallery ALL is presenting a curated collection of Kyttanen's other works as part of the Collective Design Fair in New York.

These include the infinite spiral of the Rollercoaster tables, exhibited in a sandblasted champagne finish, and the Sedona dining table in polished aluminium.

Also on display at Collective Design, taking place from 4 to 8 May 2016, is a soapstone cabinet and all-leather chair by Fort Standard and a range of furniture that traces the motion of moving elements by Nendo.

The event falls within the broader NYCxDesign festival, 3 to 17 May 2016, where Lambert & Fils is debuting a collection of pendant lighting.