Cardia

Build **Cardia** — an interactive visualization of the human heartbeat that makes one cardiac cycle beautiful and legible at once. It should let a curious person actually understand what happens each time the heart beats, and how the pieces relate. Bring together, in one coherent piece: - A beating heart you can watch — the four chambers filling and contracting in the right order, and blood moving through them (in blue on the way to the lungs, red on the way out to the body). - The electrical story synced to it — an ECG trace drawing in time with the beat, with its familiar P-QRS-T shape, so the visitor can see the electrical signal that drives each contraction. - Live readouts that update — heart rate, and a clear labelling of the phases (systole/diastole) as they happen. - A control to change the heart rate (resting to exertion) and see everything speed up and respond together. Generate all the plausible data and waveforms yourself, inline — no external data or images. Draw the heart, flow, and trace with SVG or canvas. The register is clinical but alive: precise, medically credible, and quietly beautiful — the kind of explainer a good science museum would commission. This challenge stresses **data/scientific visualization** — synchronising multiple linked views (anatomy, flow, signal, numbers) into one clear, animated whole. All design decisions — layout, palette, technique, level of detail, interaction — are yours. There is no single right answer; make something with a point of view.