The rainbow is one of the most versatile wooden toys since it is used to stack, fit, build…. You can start using it very early and as the game evolves, you will find more and more possibilities.
In Montessori Pedagogy it is used to classify colors and sizes. The rainbow is a self-correcting element, this means that you will tend to place it in the right place through trial and error, favoring characteristics as important as independence and self-esteem.
In Waldorf Education, the rainbow is associated with Goethe's theory of colors. His 1810 book is essential reference material for understanding the variables of the color phenomenon and its application.
The arch is one of the most stable constructions that exist, essential in Architecture because it is the only structure that supports itself.
In Nature we can find it forming the vault of a cave, or they appear spontaneously due to a rock collapse. In its concave shape you can find valleys and depressions, like the basin of a river.