Brown Stair Prism: Individual 20×1×1cm Replacement Piece
The thinnest prism of the Brown Stair, one centimetre square and twenty long, in the clear lacquer the supplier gives the whole set. Every prism in the stair is the same twenty centimetres long and differs only in thickness, from one centimetre up to ten, so the stair isolates a single variable and this smallest piece is the unit the other nine are measured against. Without it the stair no longer starts anywhere. The complete Brown Stair is a separate item.
“Free the child's potential, and you will transform him into the world.”
The Brown Stair, or Broad Stair, embodies Dr. Montessori's principle of isolating difficulty by focusing solely on variations in width while length remains constant.
- Visual discrimination of width in two dimensions
- Development of mathematical concepts through sensorial experience of squared relationships
- Refinement of muscular memory through carrying and stacking movements
- Vocabulary enrichment: thick/thin, thicker/thinner, thickest/thinnest
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This material demonstrates the mathematical relationship of the square of numbers (1², 2², 3²...10²) through concrete manipulation. The clear lacquer finish preserves the natural wood grain, allowing the child to experience the material's authentic texture while ensuring durability. Through repeated sensorial exploration, children develop visual discrimination of dimensions and internalize mathematical concepts through their absorbent mind. The material's self-correcting nature supports the child's natural tendency toward precision and order, building concentration and preparing the mathematical mind for later abstract concepts.
How to present it
Follow the Montessori method of presentation for optimal child development.
Place the Brown Stair on a mat with adequate space. Ensure prisms are clean and arranged randomly. Sit to the child's dominant side.
- 1
Invite the child, showing how to carry one prism at a time with two hands
Model slow, deliberate movements to emphasize care and respect for the material - 2
Build the stair from thickest to thinnest, aligning on one side
Use your index finger to trace along the aligned edge, highlighting the gradation - 3
Introduce three-period lesson for language: 'This is thick/thin'
Only introduce comparative and superlative language after the child masters positive degree - 4
Dismantle thoughtfully, returning prisms to random arrangement
This prepares for the next child and provides additional discrimination practice
Every Child Is a Little Creator
Heritage
Since 1929
Brands used by
schools worldwide
European brands
AMI
Endorsed
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