The Stedelijk Museum Amsterdam has added 'Untitled (Flower Work)' (1974) by Bas Jan Ader to its permanent collection, marking the first work by the Dutch conceptual artist to be held by the institution. Donated by the artist's brother, Erik Ader, the piece consists of three photo series depicting the systematic removal of flowers to leave only primary colors. The work is scheduled for public display later this year as part of the museum's 'Everyday, Someday and Other Stories' collection presentation.