Poincaré disk model — drag to navigate, curvature K = −1
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Drag canvas to move viewpoint Mouse wheel to zoom
Poincaré disk: The entire hyperbolic plane fits inside the unit circle. Equal-sized shapes near the boundary are actually much larger in hyperbolic space.
Geodesics: straight lines in H² appear as circular arcs meeting the boundary at right angles.
Area of disk r: 2π(cosh r − 1), grows exponentially vs πr² in Euclidean space.