 Less work has been done on describing episodes in science where elegance—as opposed to parsimony—has been (or may have been) the crucial factor. This may just reflect the fact that considerations linked to elegance are so pervasive in scientific theory choice as to be unremarkable as a topic for special study. A notable exception to this general neglect is the area of celestial mechanics, where the transition from Ptolemy to Copernicus to Kepler to Newton is an oft-cited example of simplicity considerations in action, and a case study which makes much more sense when seen through the lens of elegance rather than of  parsimony.[14]