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     <h1>Two poles <i>of one sphere</i></h1>
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   <p class="lede">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.</p>
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+  <video id="v" controls playsinline preload="metadata" src="https://teahub.xyz/maths/videos/raw/commit/ec0bb56210abe087f4731777ffba8d1fa6bab3df/yantra-two-poles.mp4"></video>
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       <h2>On the sphere</h2>