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These parallel lines appear to intersect in the vanishing point "at infinity". In a projective plane this is actually true.
These parallel lines appear to intersect in the vanishing point "at infinity". In a projective plane this is actually true.
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Möbius strips, which have only one surface and one edge, are a kind of object studied in topology.
Möbius strips, which have only one surface and one edge, are a kind of object studied in topology.
A continuous transformation can turn a coffee mug into a donut. Ceramic model by Keenan Crane and Henry Segerman.
A continuous transformation can turn a coffee mug into a donut. Ceramic model by Keenan Crane and Henry Segerman.