As the Smithsonian Museum explains in its exhibit of a pair of ruby slippers, this creative change was a purely aesthetic choice ... the slippers turned ruby red for the film.

The transformation isn’t merely aesthetic—it’s a deliberate choice ... in an era dominated by black-and-white cinema. The ruby red created a stunning visual contrast against the yellow ...

However, wider adoption of cool roofs has been hindered by aesthetic considerations ... coating and exposed to bright sunlight, the dark-red ruby-covered coating stayed cooler than an off ...