- a few balloons
- a few matchsticks
- a felt pen
In "normal" (i.e. flat, or euclidean) space, when you move an object of fixed size away from an observer, the angle subtended by that object at the observer decreases linearly with increasing distance. However, in curved spaces, things are not so simple. Specifically, it is possible that an object of fixed linear size will subtend a decreasing angle at the observer, but at some distance from the observer, the subtended angle will actually start to increase. To demonstrate and explore this effect bring the following items to the next tutorial:
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