Anthropogenic cloud
The intermediate layers of the troposphere are the regions with less influence of human activity. This region is far enough from the surface for not being affected by the surface emissions. Additionally, commercial and military flights only cross this region during ascending or descending maneuvers. Moreover, in this region there exist two types of clouds with a large horizontal extension: "Nimbostratus" and "Altostratus", which cannot originate from human activity. Consequently, it is assumed that there are no anthropic clouds of these two "genera". However, what can occur is enhancing existing "Nimbostratus" or "Altostratus" due to the additional water vapor or condensation nuclei emitted by a thermal power plant, for instance.
Cloud (video game)
The game contains three types of clouds: white clouds, which follow the avatar; gray, neutral clouds, which become white when touched; and black clouds, which may be combined with white clouds to cause rain, dissolving both clouds. A large number of white clouds more easily dissolves a small number of dark clouds than an equal number, and vice versa. White clouds stop following the avatar if the player moves too quickly and they resume following if approached again. Each of the four missions in "Cloud" has a different objective, including forming patterns in the sky with clouds, eliminating black clouds, and creating rain over each of the islands.