A child damaged Mark Rothko's painting worth millions at the Museum Boijmans Van Beuningen in Rotterdam during an unguarded moment. The damage is superficial, with small scratches noted. The museum is exploring restoration options and expects the painting to be displayed again. Experts highlight the challenges of restoring unvarnished modern paintings like Rothko's. The incident raises concerns for other UK institutions about displaying vulnerable artworks. Previous incidents of Rothko damage are noted, and insurance policies typically cover such accidents.