Swiss artist Felice Varini has used brightly coloured paintwork to transform the rooftop of Le Corbusier's iconic Unité d'Habitation in Marseille into a huge optical illusion (+ slideshow). More about Felice Varini creates optical illusion on roof of Le Corbusier's Unité d'Habitation
An exhibition dedicated to the friendships and rivalries between designers has seen the likes of Philippe Malouin and Bethan Laura Wood come together to create collaborative pieces (+ slideshow). More about Friends + Design exhibition explores the relationships between designers
South Korean studio Shinslab Architecture sliced off one end of a rusty old ship and turned it upside down to form this installation for the Seoul edition of MoMA's Young Architects Program (+ slideshow). More about Rusty ship transformed into cavernous pavilion for MoMA's Young Architects Program in Seoul
Chinese artist Ai Weiwei has arranged 1,005 life jackets from refugees into the shape of lotus flowers for a floating installation in Vienna (+ slideshow). More about Ai Weiwei creates lotus-like installation from refugee life jackets
New York firm Hou de Sousa has created an interactive installation in a Washington DC subway station, using over half a million plastic spheres glued together to form building blocks (+ slideshow). More about Hou de Sousa builds reconfigurable Raise/Raze installation from plastic balls
Luxembourg artist Max Mertens has installed hundreds of swings above a shopping street to offer pedestrians a new experience of a familiar place (+ movie). More about Max Mertens installs sea of swings over a busy Luxembourg street
Hundreds of reflective "pennies" form this spherical sculpture, created by Giles Miller's London design studio for Devon's Broomhill Sculpture Park (+ movie). More about Giles Miller's Penny-Half Sphere sculpture is a "double-sided portal" hanging above a stream
A condemned structure on a New York beach has been transformed into an artwork using brightly coloured spray paint by German artist Katharina Grosse (+ slideshow). More about Katharina Grosse gives colourful makeover to decaying building at Rockaway Beach
US studio James Corner Field Operations has created an installation for the National Building Museum in Washington DC that evokes a glacial landscape, with giant shard-like forms that jut upward and downward (+ slideshow). More about James Corner Field Operations installs over 30 "icebergs" in Washington DC museum
Mexican studio Escobedo Soliz has installed a web of brightly hued rope at the MoMA PS1 gallery in Queens, New York. More about Escobedo Soliz weaves colourful ropes across MoMA PS1 courtyard
London Festival of Architecture 2016: a soup servery, a rubbish bin-cum-play space and a flat-pack pop-up shop form part of an exhibition that explores how architecture can contribute to city communities (+ slideshow). More about RIBA exhibits three pavilions designed to serve London communities
Daredevils can enjoy sweeping views of Los Angeles while descending a transparent slide almost 1,000 feet above the city (+ movie). More about Glass Skyslide opens at the top of LA's tallest skyscraper
British artist and designer Gerry Judah's latest sculpture for the Goodwood Festival of Speed is a set of six giant steel spikes that curve upwards to the sky, supporting three historic BMW cars (+ slideshow). More about Gerry Judah unveils enormous spiked sculpture for Goodwood
For his first solo exhibition in the USA, Berlin-based architect Diébédo Francis Kéré has created a rainbow-coloured installation made of thousands of strands of lightweight cord (+ slideshow). More about Kéré Architecture suspends colourful strings from ceiling of Philadelphia art museum
An Italian consumer group has accused Bulgarian artist Christo of wasting taxpayers' money, because of the costs of managing his floating installation on Italy's Lake Iseo. More about Christo accused of wasting public money on Floating Piers installation
A giant slide by Belgian artist Carsten Höller that spirals through the frame of the Anish Kapoor-designed ArcelorMittal Orbit opens to the public tomorrow. More about Slide woven through Anish Kapoor's ArcelorMittal Orbit to open in east London
A gold pyramid and a suspended rock face feature in British artist Anish Kapoor's abstract set design for the English National Opera's production of Tristan and Isolde (+ slideshow). More about Anish Kapoor creates elemental set design for English National Opera
London Festival of Architecture 2016: students from the University of Brighton have created installations for London's East Street Market, including a stall of interactive games and a cocktail-making machine (+ slideshow). More about University of Brighton students create folding stalls for south London market
Metal mesh ramps illuminated by psychedelic coloured lights formed the set for Prada's Spring Summer 2017 menswear show in Milan, which was once again designed by Dutch studio AMO (+ slideshow). More about AMO installs sloping mesh catwalk for Prada fashion show
A pool of marble in the courtyard of a French chateau and a towering waterfall that appears to fall from midair at the Palace of Versailles are among the outdoor installations taking place during the European and North American summer (+ slideshow). More about The eight best outdoor installations to see this summer