The van der Grinten projection is a compromise map projection that is neither equal-area nor conformal. Areas of a fixed size at a distance from the equator look smaller than they do on a Mercator map but larger than a globe. It projects the entire Earth into a circle, though the polar regions are subject to extreme distortion. The projection was the first of four proposed by Alphons J. van der Grinten in 1904, and, unlike perspective projections, is an arbitrary geometric construction on the plane. It was made famous when the National Geographic Society adopted it as their reference map of the world from 1922 until 1988.