From 55fcc6e670213cf37476f2bebbe180623bd33687 Mon Sep 17 00:00:00 2001 From: teahubxyz Date: Fri, 23 Oct 2026 19:32:10 +0000 Subject: [PATCH] Landing page: the yantra video and two explorers --- index.html | 59 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 59 insertions(+) create mode 100644 index.html diff --git a/index.html b/index.html new file mode 100644 index 0000000..f708a60 --- /dev/null +++ b/index.html @@ -0,0 +1,59 @@ + + + + + +Two Poles of One Sphere + + + + + +
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maths · projective geometry
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Two poles of one sphere

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The Śrī Yantra turned inside out by circle inversion, then wrapped onto a ball by stereographic projection. On the sphere the inversion is just a flip, and the bindu and infinity are the two poles.

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On the sphere

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Spin the yantra and its inversion on the Riemann sphere. Slide the lift, compare stereographic with great circles, and switch the sphere off to watch only the plane.

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On the plane

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The yantra inverted in its own outer circle, z ↦ z / |z|². Pan and zoom out to follow the arcs toward infinity.

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four upward triangles · five downward · the bindu

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Triangle coordinates follow a numerical solution of the yantra's concurrency conditions (after Kulaichev and Huet), drawn as 27 lines with 29 triple points.

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