Vanessa cardui painted lady's migration pattern in northern Europe apparently does not follow a strict northwest heading. The range of headings suggests that migrating butterflies may adjust their migration patterns in response to local topographical features and weather, such as strong wind patterns. Laboratory-raised autumn-generation painted lady butterflies were able to distinguish a southern orientation for a return migration path. According to the same laboratory-based study, when butterflies were isolated from the sun, they were unable to orient themselves in a specific direction, opposed to those that did have access to the sun. This suggests that "V. cardui" requires a direct view
Black and white been used to light for color. By shooting in black-and-white, the filmmakers did not have to rent lighting equipment. The movie "Pi" is filmed entirely in black-and-white, with a grainy effect until the end. In black-and-white still photography, many photographers choose to shoot in solely black-and-white since the stark contrasts enhance the subject matter. Some formal photo portraits still use black-and-white. Many visual-art photographers use black-and-white in their work. As a form of censorship when movies and TV series are aired on Philippine television, many gory scenes are shown in black-and-white. Sometimes the exposure of innards or other scenes too