Wooden Rainbow Stacking Toy - GreenThis is a rainbow stacking toy, featuring beautiful bright colours that range from green tones down to earthy rusts and neutrals. A stacking rainbow toy is one of the most popular toys. Its minimalist design encourages children to use their imagination to the fullest and that is why this open ended toy may be used in variety of games. How might one play with the rainbow toy? With an arch stacker a child develops coordination and fine motor skills.