The final extract from our Book of Ideas selected by Dezeen editor-in-chief Marcus Fairs this week is a 24-hour performance involving two janitors constantly sweeping lines of rubbish to represent the hand of a clock. More »

Combs, lighters and babies' dummies are among the hundreds of objects found washed up on British beaches and then hung in the atrium of a new London cancer centre by designer Stuart Haygarth. More »

Architect and writer Sam Jacob wants to transform St Paul's Cathedral in London into a live map of the phases of the moon. More »

French artist Olivier Grossetête used three enormous helium balloons to float a rope bridge over a lake in Tatton Park, a historic estate in north-west England. More »

Playing on these swings outside an arts centre in Guimarães, Portugal, generates electricity to power lighting under the floor (+ movie). More »

In a movie filmed by Alice Masters for the Design Museum's annual Designers in Residence exhibition, Lawrence Lek explains how he created a modular system of plywood pieces that can be bent into objects including a stool and a pavilion. More »

Interieur 2012: Studio Makkink & Bey built a house of scaffolding and stairs to represent the transient, roaming lifestyle of the future as their contribution to the Future Primitives series at last month's Interieur design biennale in Kortrijk, Belgium. More »

Hundreds of spinning blades reveal the invisible patterns of the wind in American artist Charles Sowers' kinetic installation on the facade of the Randall Museum in San Francisco (+ movie). More »

An ancient Chinese courtyard garden tucked away in the hutongs of Beijing provides the setting for seasonal installations at curated design shop WUHAO. More »

Interieur 2012: data from the ripples of a nearby river animated this mechanical installation by American artist and designer David Bowen, which hung over visitors' heads at the Interieur design biennale in Kortrijk, Belgium, last week (+ slideshow). More »

Interieur 2012: British designer Ross Lovegrove presented a futuristic concept car shaped according to instinct rather than science at the Interieur design biennale in Kortrijk, Belgium, last week (+ movie). More »

Dutch Design Week: twenty-five designers set up their own production lines inside a former textile factory in the Netherlands last week, making furniture, lighting, clothes, shoes, food, paper and more with the help of visitors. More »

Interieur 2012: American architect and designer Greg Lynn has created a prototype for a motorised compact-living cocoon that rotates to provide space for relaxing, sleeping and bathing (+ movie). More »

Designers including Marco Dessi, Tomáš Král and Adrien Rovero created experimental mirrors for an exhibition organised by Adam Štěch of Czech design firm OKOLO and curator Klára Šumová during Designblok 2012 in Prague this month. More »