Retired stockbroker began buying in 1967

Exhibition will be Chicago artist's first public project in the UK

International collectors plan to share exhibitions and co-commission works of art

US edition of 1:54 features work by several artists who are also showing in the Venice Biennale

Gina Diez Barroso opened Centro university for design and media in Mexico City in 2004

Picasso’s Les Femmes d’Alger is priciest work ever sold at auction, fetching almost $180m in New York <br>

Putting on an event of this size is an expensive business—and increasingly it is dealers, collectors and foundations that are stumping up

Political and cultural intrigue has flourished in the 120 years since the festival was founded

New law would dilute powers of the “commissaires-priseurs” system and give responsibility to non-experts

Ten new works for parts of the city thanks to High Street Fund initiated after 2011 riots<br>

Although show focuses&nbsp;on his work, a research project will be launched&nbsp;on his life and beliefs

Ghanaian artist will receive award at the Venice Biennale in May

But buyers are not risking large sums, with the majority of works still priced below £10,000

<p> High-speed rail line threatens prehistoric sites of cultural importance, according to group </p>

Yves Bouvier is reportedly to be replaced by a group of independent directors

More than 50 venues around the city are organising events and exhibitions that focus on decorative arts and artisans