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? "vagueness, mysteriousness, obscurity and inaccessibility to the masses". Tolstoy lambastes such works, insisting that art can and should be comprehensible to everyone. Having emphasised that art has a function in the improvement of humanity - capable of expressing man’s best sentiment - he finds it offensive that artists should be so wilfully and arrogantly abstruse. One criticism Tolstoy levels against art is that at some point it "ceased to be sincere and became artificial and cerebral", leading to the creation of millions of works of technical brilliance but few of honourable sentiment. Tolstoy outlines four common markers of bad art: