Have them imagine this is the surface of Earth or a globe. One at a time, place the peels on an overhead projector and discuss the shapes as a whole class. Ask them to peel the orange, trying as best they can to keep the peel in one piece. To demonstrate the challenge of moving from 3-D to 2-D with a sphere, invite 4-6 volunteers to the front of the room and give each a navel orange or other type of orange that is easily peeled. Demonstrate the challenge of transferring a spherical surface to a flat surface.Įxplain that cartographers and others needing flat maps for practical uses have long been challenged to show Earth, a three-dimensional sphere, on a flat, two-dimensional plane.
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