Book Day, also known as Free Book Day, is observed in Germany every May 10. This day serves as a somber reminder of the Nazi regime's book burnings that occurred in 1933, where about 25,000 volumes deemed "un-German" were destroyed, including works by notable authors such as Albert Einstein and Franz Kafka. The observance was first established in 1947 to highlight the dangers of censorship and was reinstated in West Germany in 1987 at the insistence of the Society of German Booksellers. In Berlin, a memorial designed by Micha Ullman at Bebelplatz commemorates these events, featuring a glass plate that reveals empty bookcases symbolizing the lost literature. The main goal of Book Day is to prevent the recurrence of such atrocities by remembering the past.