Article: For this experiment, the globe will represent a round earth, and the map will represent a flat earth. The lamp in the middle will be the sun. This experiment works best when it's dark out or all the windows in the room are covered. You want the light coming from the lamp to be the only light in the room. Look at the globe and notice how half of it is lit up and half of it is dark. Then, notice how the map is completely illuminated. The globe does, right? After all, if the earth was flat like the map, then all of the earth would be lit up by the sun at the same time. That wouldn't make sense, since we know that the whole world doesn't experience day and night at the same time. With the globe, half of it is lit up while the other half is dark. That's the same as what we observe here on earth half of the world experiences day while the other half experiences night. Therefore, it makes sense that the earth is round!
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Place a lamp in between a globe and a world map. Turn off all the lights in the room except for the lamp. Observe how the light shines on the globe and the map differently. Ask yourself whether the round globe or flat map seems more realistic.