Montessori Rotenburg in Germany celebrated Maria Montessori's birthday on August 31 with great pleasure. They planted 150 tulips in the shape of 150, read children's books about her life, made a beautiful time-line of Maria Montessori's life, and many other activities.  The children cut out 150 red hearts which they threw into the air as they shouted in one voice "Hurray and congratulations, Maria Montessori".