The van der Grinten projection is a compromise map projection, which means that it is neither equal-area nor conformal. Unlike perspective projections, the van der Grinten projection is an arbitrary geometric construction on the plane. Van der Grinten projects the entire Earth into a circle.
The van der Grinten projection is a compromise map projection, meaning it doesn't perfectly preserve area or shape. Unlike perspective projections, it's a purely geometric construction that circles the globe.