The Tower of London’s ceramic poppies, used in a Remembrance Day art display in 2014, are part of a new project called: Where Are the Poppies Now. Headed by 14-18 NOW, the U.K.’s art programme for the First World War centenary, the project seeks to pinpoint the poppies on a digital map. Many will recall the Tower of London’s inventive and heartfelt installation back in 2014—Blood Swept Land and Seas of Red—a collaborative effort from...