Weather map motion. Two-dimensional streamlines based on wind speeds at various levels show areas of convergence and divergence in the wind field, which are helpful in determining the location of features within the wind pattern. A popular type of surface weather map is the surface weather analysis, which plots isobars to depict areas of high pressure and low pressure. Cloud codes are translated into symbols and plotted on these maps along with other meteorological data that are included in synoptic reports sent by professionally trained observers. The use of weather charts in a modern sense began in the middle portion of the
What is a Masterpiece? particular (the fruits of the era in which the artist lived) with the universal (the grand themes raised by the human condition itself) in Clark's view. Clark's definition of an artistic masterpiece was based on a number of different considerations and criteria that apply to different works produced in markedly different time periods and milieux. For example, in this particular work he argued that it is the "creation of an individual artist's authentic genius." At the same time, he expounded a number of other aspects that for him were essential in the configuration of a masterpiece: that it is "a