Instructors tell children:

• Inward curves are lines that curve inward.
• Outward curves are lines that curve outward.

Instructors show children examples of:

• Inward curves, such as the inside of hats, bowls, or cups.
• Outward curves, such as the outside of an apple, ball, or orange.

Instructors show children the lesson image (scenes A-G), and ask children to point to the following surfaces:

• Horizontal, straight
• Oblique, straight
• Inward curve (2)
• Outward curve (3)

Children complete the following drill work:

1. Draw a ball on a horizontal surface.
2. Draw a ball on an oblique surface.
3. Draw a ball on an inwardly curved surface.
4. Draw a ball on an outwardly curved surface.
5. Draw a tree on an outwardly curved surface.
6. Draw a tree on an inwardly curved surface.
7. Draw a shanty on an outwardly curved surface.
8. Draw a shanty on an inwardly curved surface.