To mark its 2oth anniversary the design museum has commissioned four leading designers - Tord Boontje, Margaret Calvert (above), Konstantin Grcic and architect David Chipperfield - to produce an original piece of artwork that will be sold exclusively in the Design Museum shop, each available as an edition of 100. £100, designmuseumshop.com

Birdman by Tord Boontje

The Chairs by Konstantin Grcic