Recommended age:  

3-6 years

Purpose of the Brown Stair

The purpose of the Brown Stair is educates the hand to perceive differences in size, shape and weight. Develops visual discrimination of size in three dimensions. Indirectkly prepares the child for mathematical concepts in plane geometry, area and volume.

Control of error: the child can usually see if the stair has been badly built.

See the "Technical Description" section for the procedure for presenting this material to the child. 

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This series of prisms demonstrates to the child the change in width (breadth), while the length remains constant. Practice with The Brown Stair indirectly prepares the child for concepts in plane geometry, area and volume. The prisms are crafted in precise progressions from 1x1x20 cm to 10x10x20 cm.


  1. Spread a mat on the floor.
  2. Bring the prisms to the mat, one at a time.
  3. The prisms should be held by spreading the hand over the top.
  4. Place each prism on the mat. Use the space in the middle or towards the right side of the mat. The prisms should not be placed in orderof size. Mix them so that the child would have to look at them to decide which to choose.
  5. Take the largest prism by holding it with both hands on either side, and place it at the top left hand corner of the mat.
  6. Take the next largest prism by holding it with both hands on either side and place it in front of the first prism.
  7. continue in this way until all the prism are in a stair formation. give the child a chance to observe the information.
  8. Undo the stair by removing one at a time and placing them to the right of the mat.
  9. Continue in this manner until all the prisms have been removed.
  10. At this point, the child may ask you, or you may ask  the child to try the exercise.
  11. At the end of the exercise let the child help you to take the prisms one by one, back to their pace on the shelf.
  12. Let the child help to roll the mat and put it away.


Construct the stair as before and place the smallest prism on each stair one after the other. This helps the child to observe the difference in dimension that exits between each prism. The difference between any two prism in successiion is always the smallest prism. 


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Pedagogically specialized environments. Certified quality of materials and products.

Innovative projects

Our Research & Development Department, with the advice of experts from various fields, constantly works on the technical perfection and stylistic renewal of our lines and products.

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Multiyear warranties and after-sales service. Corporate and product safety certifications. Design layouts and custom furnishings. Technical and pedagogical consultancy.

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The solutions offered are tailored to the customer's needs: from the first contact to the assembly of the furniture, Gonzagarredi follows its customers every step of the way

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High quality products

Our products conform to the latest technical standards in force in the sector with non-toxic paints and dyes, Class E1 formaldehyde limits, Class 1 wooden furniture on request and Class 1IM soft elements, according to Italian Ministerial Decree of 16th July 2014. All have been successfully tested in accredited laboratories for safety, resistance and toxicity.

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