Joining a strip's ends after a half-twist creates this surface with one side and one boundary edge.

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Your new ahaMöbius Strip

Möbius Strip: Twisted surface with only one continuous side. Source: Möbius strip ↗

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25This traditional Chinese puzzle rearranges seven flat pieces into silhouettes.RECALL
Tangram
A tangram's seven flat pieces can be rearranged into countless different silhouette shapes.
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26This broad branch of geometry departs from Euclid's parallel postulate; curved-space examples help describe general relativity.RECALL
Non-Euclidean Geometry
Non-Euclidean geometry's study of curved space helped provide the mathematical basis for general relativity.
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27A horizontal x-axis and vertical y-axis locate points on this two-dimensional grid.RECALL
Coordinate Plane
The coordinate plane, named for René Descartes, locates points using a horizontal and vertical axis.
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