The Wooden Rainbow Stacker is a Montessori-inspired open-ended building set made from smooth, non-toxic painted wood. Available in a range of shapes, arched rainbows, semi-circles, and strips these beautiful pieces can be stacked, balanced, nested, and arranged in endless combinations. There's no right or wrong way to play, and that's exactly the point.

What's included:

Choose the set that suits your child and your space:

- 12pc Rainbow Twelve arches in a full spectrum of colours (35 × 16 cm). Maximum building and sorting potential.
- 11pc Strips Flat rectangular pieces ideal for roadways, fences, and balance play (37 × 6 cm).
- 11pc Semi-Circles Curved half-arch pieces that add a whole new dimension to nesting and construction (37 × 10 cm).

Non-toxic water based colour stain

All pieces are painted with non-toxic paint and finished to a smooth, child-safe standard.

What our OT says:

This is one of the toys I return to again and again and for good reason. The rainbow stacker sits at that wonderful intersection of beautiful, durable, and therapeutically rich.

From an OT perspective, every time a child picks up a piece, positions it, and decides where to place it, they are doing real developmental work. The graded sizing of the arches introduces early mathematical concepts like size sequencing, spatial reasoning, and visual discrimination all without a single worksheet in sight. Balancing pieces on top of one another demands bilateral hand use, postural stability, and sustained concentration; skills that underpin everything from handwriting to self-care.

The smooth wooden finish provides gentle tactile feedback, and the vibrant colours support visual attention and colour recognition. For children with sensory processing differences, this kind of open-ended, visually stimulating, hands-on play can be incredibly regulating it invites focus without pressure, and effort without frustration.

Because there's no defined outcome, children self-direct the challenge level, which is one of the hallmarks of great Montessori design. A toddler builds a simple arch; a five-year-old engineers a tunnel network. Both are winning.

Other ways to play:

The rainbow stacker grows with your child here are just some of the ways it comes alive beyond basic stacking:

Tunnels & bridges: Invert the arches to create roads, tunnels, and passages for small animals or cars
Colour sorting & matching: Group pieces by colour or gradient as an early maths activity
Balance challenges: Stack pieces as high as possible and see who can build the tallest tower without toppling
Storytelling scenes: Use the pieces as hills, caves, or rainbows in small-world imaginative play
Pattern making: Lay pieces flat and create repeating colour or shape patterns (great for pre-maths skills)
Tracing & art: Use the curves as stencils for art activities
Light table play: Place on a light table or window ledge for stunning colour-mixing and shadow exploration

Rainbow Stacker

Reviews