This beautiful Wooden Rainbow Architect Arches set has a solid center and is sequenced in rainbow order. The soft shades of color add to the beauty of this arch set experiment. The natural grain of the beechwood shows through the colored finish on these precision-cut pieces. This creates an amazing learning experience with balance, size and shape as well as color-identification and ordering, but also a fun addition to any wooden block set. Add in your cars and other fun wooden figures, and you open up endless play possibilities!