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I'm not quite sure if I'm phrasing this right. It's just occurred to me that lat/longs are two dimensional coordinates like any other projected coordinate system, so it's presumably possible to create a two dimensional map based on these unprojected coordinates.
It would obviously be centred on the point (0,0) (off the west coast of Africa, on the equator), and the 180 meridian would be exactly on the left and right borders.
Is there a name for this kind of "non-projection"? Presumably there are images of it, but I'm just not sure what to look for.