| 摘要 |
PURPOSE: Learning tools for understanding figures being different according to a view position are provided to enable users to easily understand a different view of the figures according to a view position or a distance of the figures. CONSTITUTION: A transparent internal cylinder(70) is placed at the center of a transparent cylinder(11). The transparent internal cylinder forms an internal right circular ring(72) on the same position as the position of plural right circular rings(2) formed on an inner side of the transparent cylinder. The internal right circular ring is a right circular band formed on an outer side of the transparent internal cylinder. |
