This is where horology ascends from craft to art. Brands like Patek Philippe and Audemars Piguet elevate the movement's components to a level of finish that is, by any rational measure, unnecessary. And that is precisely the point.
Côtes de Genève (Geneva stripes) ripple across bridges; perlage (circular graining) dots the base plate; anglage (bevelling) polishes the edges of gears to a perfect 45-degree angle, often by hand. These finishes are not merely decorative; they are a testament to a commitment to perfection in places only the watchmaker and the owner will ever truly see. It is a private covenant of quality.