Technical director Lisa Forsell explained that to enhance the richness and beauty of the desert landscapes surrounding Radiator Springs, the filmmakers created a department responsible for matte paintings and sky flats, saying: "Digital matte paintings are a way to get a lot of visual complexity without necessarily having to build complex geometry, and write complex shaders. We spent a lot time working on the clouds and their different formations. They tend to be on several layers and they move relative to each other. The clouds do in fact have some character and personality. The notion was that just as people see themselves in the clouds, cars see various car-shaped clouds. It’s subtle, but there are definitely some that are shaped like a sedan. And if you look closely, you’ll see some that look like tire treads. The fact that so much attention is put on the skies speaks to the visual level of the film. Is there a story point? Not really. There is no pixel on the screen that does not have an extraordinary level of scrutiny and care applied to it. There is nothing that is just throw-away."