Or not so heavy. Since it's all made out of aluminium. This is Thomas Heatherwick’s 'Extrusions series' on show at Haunch of Venison, 6 Burlington Gardens, as part of the London Design Festival.

Thomas Heatherwick is presenting six extruded, mirror polished, aluminium benches (these images are pre-polish) made without fixtures or fittings, which have been produced by the world’s largest extrusion machine. Heatherwick Studio commissioned a specially designed die through which aluminium was ‘squeezed’ into a chair profile, complete with legs, seat and back.

The resulting exhibited extrusions are the early prototypes for a final outdoor installation – a 100 metre-long piece that tangles into an extraordinary form, which will be constructed and exhibited in 2010. The project, apparently 18 years in the making, takes technology used in the aerospace industry to produce the world’s largest ever extruded piece of metal. The project is also the first limited-edition work exhibited by Thomas Heatherwick. You can see them until the 7th of November, and also - in other big scale news; we thought we'd remind you that Jaime Hayon's Trafalgar chess pieces are available to play with for one more day...