Purpose:
To develop visual discrimination of width.
Age:
3 -3.5 years old
Material:
Ten brown wooden prisms all the same in length, but differing in width and height by one cm each.
Presentation:
- Show the child how to hold one of the prisms by using both hands, with one hand at each end of the prism.
- Carry each prism separately and scatter them on the mat.
- Find the thickest prism and place it in front of them child.
- Select the next thickest prism, and place it beside the first one.
- Continue building the Brown Stair
- After finished, you can show the child how the thinnest prism acts as the "control of error"
by fitting flush at the step of each stair.
- Invite the child to scatter the prisms and repeat the presentation.
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