Large Hexagon Box The beauty and creativity of Montessori's materials are so clear with these amazing triangle boxes. Explore, slide them here and there and then shout,"Look what I made!" Lessons start as classic steps and then when children show me mastery of the first lesson they are free to explore creative possibilities even with adding other works as embellishments. Each Constructive Triangle Box has an idea book filled with winning snapshots of children's past good ideas to recreate. These idea books are used a lot. This is the cover of the idea book they can look at.