Three to see: New York
From Basquiat's $110m skull in Brooklyn to Viennese luxe in uptown Manhattan
Sotheby’s acquires tech startup Thread Genius
The company uses image recognition software to find works of art that match users’ tastes
Paddle8 to allow cryptocurrency in online auctions
The auction house has merged with Swiss technology company The Native
Hobby Lobby surrenders 245 ancient seals to federal authorities
The company still owes more than 1,700 objects as part of a $3m settlement with the US government
Outsider Art Fair welcomes new exhibitors to New York
Genre continues to embrace ever-widening fringe, to collectors’ delight
Object Lessons: our pick of New York's Winter Antiques Show
Alaskan seal mask, Japanese Buddhist deity and an 18th century Chinoiserie screen on show at event's 64th edition
New York City to move one controversial monument, while others remain
A commission created to review “symbols of hate” on city property has decided most will stay put with signage added to explain their history, while new works will be created to honour underrepresented communities
Trump: the first year
How have artists responded to the US president’s first 12 months in office?
Object lessons: our pick of highlights from upcoming design auctions in New York
Works by George Grant Elmslie, Umberto Bellotto and Jean Royère
The Warehouse goes Pop
Warhol, Johns and Lichtenstein are among the stars of a show drawing on the collection of Martin Margulies
Lars Jan: Making waves in Miami Beach
With his immersive installation, the artist wants to raise awareness of climate change
Battle of the Brazilian Basquiat shows
Sao Paolo museum drops show after Banco do Brasil Cultural Centre decides to organise its own
Send in the clowns: Ugo Rondinone at the Bass
New galleries open with first solo US museum show by the Swiss installation artist
The top ten shows to see in Miami this week
From a look at artist’s studios at the ICA and Dara Friedman’s intimate films at Pamm, to Michele Oka Doner’s underwater explorations at the Lowe
Object lessons: a Bellekin nautilus shell, an Achrome by Piero Manzoni and a seascape by Emil Nolde
Our pick of highlights from upcoming auctions
Object lessons: a double-spiral nail work by Günther Uecker from the collection of Helge Achenbach and other auction highlights
Our pick of highlights from upcoming auctions
Object lessons: late works by Maria Lassnig and Di Cavalcanti and a creative chair by Roy Lichtenstein
Our pick of highlights from upcoming auctions
Object lessons: a painting from Max Ernst's Arizona period, a Kurt Schwitters Merz collage, and a Cubistic still life by Jean Metzinger
Our pick of highlights from upcoming auctions
Three to see: New York
From abstract photographs of pre-Columbian monuments to a fairy-tale forest
Object lessons: a futuristic furniture find, a late Bernard Buffet, and a window on 19th century Goa
Our pick of highlights from upcoming auctions and fairs
Ancient relief seized from dealer at Tefaf's fall edition in New York
The work, depicting an Achaemenid soldier and dating from the 5th century BC, was ordered removed from the stand of Rupert Wace by the district attorney
Object lessons: a medieval Flemish altarpiece, a luck-themed cabinet, and a rare cast of an Antonio Canova sculpture
Hundreds of years of historic works are on offer at Tefaf New York's fall edition, including these picks from the fair
Activists deface American Museum of Natural History’s Theodore Roosevelt monument
The group says it splashed red paint on the statue as “an act of applied art criticism”
Brazilian arts group calls out censorship by 'arrogant fundamentalists' in open letter
More than 1,000 artists, curators and professionals have signed the protest document published by the pro-democracy collective Pela Democracia
Object lessons: a print by Edvard Munch, a Zsolnay charger and a poster for TFL by Jean Dupas
Our pick of highlights from upcoming auctions
Ai Weiwei calls out Trump’s divisiveness and ‘super rich people’ at Cooper Union talk
The artist discussed the impetus behind his New York City-wide public art project Good Fences Makes Good Neighbors
Object lessons: unseen photographs of the Romanovs, an early Ken Price ceramic work, and Sadie Coles's own Neo Rauch painting
Our pick of highlights from upcoming auctions