The instructor tells children the following:

• Thus far, you've created flat drawings in the two dimensions of length and breadth.
• Now we will study prisms - form in three dimensions - length, breadth, and depth.
• We will draw three dimensional (3D) representations of the triangle, the rectangle, and the circle.

The instructor shows children the following in the top image:

• Rectangle
• Right Triangle
• Equilateral Triangle
• Obtuse Triangle
• Rectangular Prism
• Right Triangular Prism
• Equilateral Triangular Prism
• Obtuse Triangular Prism
• Three Dimensional House (Combination of Triangular and Rectangular Prism)

The instructor shows a a real example of a rectangular prism:

• Use a crayon box or other small box as a model.
• Place the box on the table before you in the position of the bottom image.
• Observe that the box has:
• Six faces. Top face, bottom face, front face, back face, right face, and left face.
• Four vertical edges, four horizontal edges, and four horizontal receding edges:
• Twelve edges or lines in all - three sets of four lines each (four vertical, four horizontal, four horizontal receding).
• The four receding lines all converge on a point on the horizon.

The instructor helps children master drawing a rectangular prism:

1. Use an erasable pencil for the drawings. Draw freehand without a ruler.
2. Draw the front face - A, B, C, D.
3. Draw a line above the front face of the rectangle representing the horizon.
4. Choose the eye point of vision on the horizon and mark it with a dot.
5. Draw light lines from each of the corners to the eye point.
6. Draw the back face E.
7. Finish the visible lines with heavier strokes.
8. Add a few trees - recall that the horizon passes through where the branches/foliage meet the trunk.
9. Repeat steps above until mastered.