Projection Room
Every flat map of a sphere has to lie about something. Put two projections side by side, turn on the distortion circles, spin the centre meridian, and click any two countries to compare their apparent and true sizes.
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Mercator → Equal Earth
Both maps share the same width at the equator, so what changes as you drag is only what each projection does with latitude. Mercator spends almost half its height on the polar regions; Equal Earth gives that space back to the tropics, where most people live. Follows the centre meridian, Tissot and graticule settings above.
The slider interpolates between the two projections' equations point by point, so the in-between frames are not real projections — they are the journey. Uses the centre meridian, Tissot and graticule settings above; the two picked countries stay highlighted.