LONDON (AP) - Ai Weiwei is taking on Lego, brick by brick.

LONDON (AP) Ai Weiwei is taking on Lego, brick by brick.

Art galleries around the world are collecting plastic bricks for the artist after the Danish toy company refused to supply Lego for his latest project.

Ai, whose work is often critical of Chinese authorities, says Lego last month refused a bulk order from an Australian gallery where he plans to build a new artwork on the theme of freedom of speech.

Ai called the move censorship, but Lego says it can't endorse the use of its bricks in projects with a "political agenda."

London's Royal Academy is encouraging supporters to fill a BMW in its courtyard with Lego bricks for Ai. Galleries including the Brooklyn Museum and Australia's National Gallery of Victoria have done the same.