In the 1930s, American astrologer Marc Edmund Jones proposed that beyond individual aspects, the overall distribution of the ten visible planets around the 360Β° chart wheel forms recognisable shapes β and that the shape itself, independent of sign or house meaning, says something about how a person organises and directs their energy.
The classification remains one of the most widely taught frameworks in modern Western astrology for getting a fast, birds-eye read on a chart before diving into the sign-by-sign, house-by-house detail.