Brown Stair (Broad Stair)

The Brown Stair isolates two dimensions (width and height) while length remains constant. This helps children perceive thickness distinctly from length.

• Framework: Montessori
• Unit: Sensorial
• Learning area: Visual Discrimination
• Level: Ages 3-5

Objectives

• Discriminate between two-dimensional size (width/height)
• Develop perception of thick/thin
• Build muscular perception of weight
• Prepare for measurement concepts

Materials

• Brown Stair: 10 brown wooden prisms
• Prisms graduated in two dimensions while length stays constant (20cm)
• Work mat

Instructions

1. Carry prisms one at a time with two hands. 2. Place randomly on mat. 3. Select thickest prism, place at left. 4. Find next thickest, place beside it, flush at one end. 5. Continue to thinnest prism. 6. Run fingers along stair edge to feel graduation. 7. Dismantle and return.

Educator tip

The weight increases dramatically with thickness—children naturally sense this difference while carrying.

Assessment

Child arranges prisms correctly from thickest to thinnest with ends aligned.

More from Sensorial

• Red Rods
• Color Tablets Box 1
• Color Tablets Box 2
• Color Tablets Box 3: Grading
• Touch Tablets (Rough & Smooth Boards)
• Fabric Matching
• Thermic Tablets
• Sound Cylinders