Trisha Donnelly

A three-part exhibition at CCA Wattis Institute for Contemporary Arts, San Francisco, draws on the ensemble form and musical score to deliver a vision of cacophonous community

From Nina Canell's seven tonnes of mollusc shells at Berlinische Galerie to a leftist-philanthropic flower show at Isabella Bortolozzi, Claire Koron Elat previews the essential exhibitions opening in the German capital

At Matthew Marks, New York, the artist’s enigmatic marbles and projections perform a subtle excavation of the gallery’s architecture 

Ahead of Art Cologne this week, a guide to the best current shows in the city

Helen Marten wins the 2016 Turner Prize; Harper Lee and Mark Twain novels removed from US schools; Ousmane Sow passes away

Fridericianum, Kassel, Germany

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Casey Kaplan Gallery, New York, USA

Various Venues