| 摘要 |
Instructional devices include information, such as a map, instructions, or any other visually discernable type of information is formed on one surface and is physically and spatially related to information on a second surface, and in one embodiment, the first surface is a map of the world and a second surface is an antipodal map of the world reversed by 180 DEG . By making a mark on the first surface, a Mark-Thru is produced at the corresponding point on the second surface. This concept is shown as applied to anaglyphs on which the information is projected on surfaces and on examinations or tests in which examination questions of multiple-choice type are formed on a first surface and the Mark-Thru indicates the correctness of answer on the second surface.
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