This example visualizes the physiological changes astronauts experience in microgravity, using a public-domain WebVTT subtitle file from a NASA video as its data source. The visualization is built with a custom JavaScript application, likely using the Canvas API to render a stylized animation of the human head and eye. It depicts how fluid shifts toward the skull, increasing intracranial pressure, which then flattens the back of the eyeball and swells the optic disc and blood vessels. The animation walks through each step of this causal chain, illustrating the mechanisms behind vision changes like far-sightedness and cotton wool spots.