Broad Stair

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Broad Stair
Sensorial - Visual Discrimination of Size
Broad Stair.jpg
Age2.5 - 3.5
Prerequisitessmall muscle coordination
Pink Tower
Materialsset of Broad Stair prisms

Also called the Brown Stair.
Use of this material teaches the child visual discrimination of thickness.


  1. Starting with the thinnest prism, carry the prisms one-by-one to a mat. Lay them out randomly, but all aligned vertically.
    Broad Stair 1.JPG
  2. Find the thickest and the thinnest of the prisms and set them at the bottom of the mat. Point to each and say to the child, "This is thick. This is thin." Then mix the two prisms back in with the others.
    Broad Stair 2.JPG
  3. Take the thickest prism and set it in the upper left-hand corner of the mat. Then find the next thickest and set it to the right of the first.
    Broad Stair 3.JPG
  4. Continue until all of the prisms have been put in order creating a stair.
    Broad Stair 4.JPG
  5. To put the work away, carry the prisms back to the shelf one at a time starting with the thickest one.


Segment on Broad Stair begins at 15:20.

Points of Interest

Control of Error

Variations and Extensions


Make Your Own

Where to Buy

Prices and links checked: 31 July 2020

Broad Stair
Store Price
Absorbent Montessori $65.00
stained wood
painted wood
Affordable Montessori $105.00
Alison's $140.00
natural wood
Alison's $71.40
Best Montessori Toys $124.99
Bruins $170.00
E & O
brown lacquer
E & O
painted brown
Hello Wood $175.00
IFIT $89.00
Kid Advance $87.99
Leader Joy $95.95
Materials Co. of Boston $135.00
Montessori Concepts $96.00
Montessori Outlet
brown lacquer
Montessori Outlet
clear lacquer
brown lacquer
clear lacquer
Pink Montessori
clear lacquer
Pink Montessori
brown paint
Pink Montessori
brown paint
Thinkamajigs $96.95

Further Reading