Felice Varini creates optical illusion on roof of Le Corbusier's Unité d'Habitation

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).

Felice Varini transforms rooftop of Le Corbusier's MAMO into optical illusion

Varini added sections of red and yellow paintwork to the concrete blocks that make up the roof terrace of Le Corbusier's famous housing scheme. These appear to connect when viewed from certain angles.

The artist, who specialises in site-specific perspective artworks, created the piece for the MAMO arts centre that now occupies the building's roof.

Felice Varini transforms rooftop of Le Corbusier's MAMO into optical illusion

The installation uses the concrete walls of the building as a giant canvas and spans the whole terrace of the centre.

The fragments of red and yellow paintwork align from three vantage points on the terrace to complete geometric patterns.

Felice Varini transforms rooftop of Le Corbusier's MAMO into optical illusion

"This place is a landmark, a huge influence," said Varini, who often works with architecture and previously created a similar installation at the V&A museum in London.

"It is a true microcosm, designed as a small city with its range of complex volumes, a small city with a view over the large city of Marseille."

Felice Varini transforms rooftop of Le Corbusier's MAMO into optical illusion

One view shows a pair of red scalene triangles with circular cut outs. Another creates a circular motif, and the third shows a series of overlapping lines.

When the viewer leaves each viewpoint, the images fragment.

Felice Varini transforms rooftop of Le Corbusier's MAMO into optical illusion

"I generally scour the venue taking in its architecture, materials, history and function," said Varni.

Felice Varini transforms rooftop of Le Corbusier's MAMO into optical illusion

"Based on its varying spatial data, I define a viewpoint around which my initiative takes shape," he added.

"For me a viewpoint is a point in the space that I choose carefully: it is usually situated at my eye level and preferably located in a key passageway, for example where one room leads to another, a landing."

Felice Varini transforms rooftop of Le Corbusier's MAMO into optical illusion

Le Corbusier's first Unité d'Habitation is arguably the most influential Brutalist building of all time. With its human proportions, chunky pilotis and interior "streets", it redefined high-density housing by reimagining a city inside an 18-storey slab block.

Felice Varini transforms rooftop of Le Corbusier's MAMO into optical illusion

French designer Ora-Ïto set up MAMO – short for Marseille Modulor – on the roof of the building in 2013. The art centre occupies a terrace originally intended as an open-air gymnasium on top of the 1950s housing block.

Varini follows a list of eminent artists to have created installations for MAMO since its opening, including Daniel Buren and Dan Graham.

Felice Varini transforms rooftop of Le Corbusier's MAMO into optical illusion

The À Ciel Ouvert installation opened at the beginning of July and will remain open to the public until 2 October 2016.