Atmospheric optics wavelengths. A halo (ἅλως; also known as a nimbus, icebow or gloriole) is an optical phenomenon produced by the interaction of light from the sun or moon with ice crystals in the atmosphere, resulting in colored or white arcs, rings or spots in the sky. Many halos are positioned near the sun or moon, but others are elsewhere and even in the opposite part of the sky. They can also form around artificial lights in very cold weather when ice crystals called diamond dust are floating in the nearby air. There are many types of ice halos. They are produced
What Is Art? inclusive: "jokes", "home decoration", and "church services" may all be considered art as long as they convey feeling. It is also amoral: "[f]eelings … very bad and very good, if only they infect the reader … constitute the subject of art". Tolstoy also notes that the "sincerity" of the artist—that is, the extent to which the artist "experiences the feeling he conveys"—influences the infection. While Tolstoy's basic conception of art is broad and amoral, his idea of "good" art is strict and moralistic, based on what he sees as the function of art in the development of humanity: just as