Yeesh · Life — One Door
The flagship of the flat-vs-globe studies. Real colored continents on the flat Gleason disk — north pole at the centre — fold continuously into the round globe as you drag one slider. The graticule, equator, tropics, the 66.6° polar circles, city pins, and the sun’s annual circuit all stay welded to the surface through the fold, so you can watch the same geometry become both pictures. A hands-on demonstration of Claim A: the disk and the sphere are metrically equivalent.
It opens with a free account — along with the full book One Father and every other app in the suite.
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