A blood-red sea of ceramic poppies is spilling from the Tower of London to commemorate British and Commonwealth soldiers killed in World War I on the 100th anniversary of its start. The Duke and Duchess of Cambridge joined Prince Harry earlier this month to “plant” the ceramic poppies in the dry moat surrounding the Tower to honor the military dead. The installation, called Blood Swept Lands and Seas of Red, is made up of 120,000 ceramic poppies. Poppies became a symbol of war dead after the crimson flowers sprang up across the battlefields of Belgium. More will be added in the coming months until there are 888,246 – one for each of the British and Commonwealth soldiers killed in the war. The installation will continue through Nov. 11, the day World War I ended in 1918.