Imagine a round ball. We can draw it on flat paper. 

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🖼️ Images & Media (22)
Stereographic projection in 3D.svg
RubensAguilonStereographic.jpg
Stereoprojzero.svg
Stereoprojnegone.svg
StereographicGeneric.svg
CartesianStereoProj.png
PolarStereoProj.png
Riemann Sphere.jpg
Inversion by Stereographic.png
Wulffnet.svg
Sphere-stgrpr-wn.svg
Wulffnetanimation.gif
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Content adapted from Wikipedia
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Readability: FK 13.5
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Vital Level 5