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CREATING OVERLAYS

Remember your high school biology textbook? It had a lot of drawings of the human body with the organs and skeleton all exposed. Sometimes you could lift up transparent sheets to “remove” organs—one might have shown the skeleton, one the circulatory system, one the digestive system, and so on. This way, you were able to see where things were in relation to each other.

The same “overlay” technique can be used in other subjects as well. An astronomy book might show a picture of the night sky. Then an overlay can show the star names. Another can show drawings of the constellations, and so on.


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