#chart  a visual display of information
  supertype:  #illustration  artwork that helps make something clear or attractive
  subtype:  #plot.chart  a chart or map showing the movements or progress of an object
  subtype:  #organization_chart  a chart showing the lines of responsibility between departments of a large organization
  subtype:  #color_chart__colorchart  a chart displaying colors
     subtype:  #color_circle__colorcircle__color_wheel__colorwheel  a chart in which complementary colors (or their names) are arranged on opposite sides of a circle
  subtype:  #bar_chart__barchart__bar_graph__bargraph  a chart with bars whose lengths are proportional to quantities
     subtype:  #histogram  a bar chart representing a frequency distribution; heights of the bars represent observed frequencies
  subtype:  #eye_chart__eyechart  a chart that is read from a fixed distance; used as a test of vision
  subtype:  #flip_chart  a chart with several sheets hinged at the top; sheets can be flipped over to present information sequentially
  subtype:  #pie_chart__piechart  a circular chart divided into triangular areas proportional to the percentages of the whole
  subtype:  #star_chart  a chart showing the relative positions of the stars in a particular part of the sky
  subtype:  #profile  a graph representing the extent to which something exhibits various characteristics
     subtype:  #population_profile  a chart showing the number of people as a function of their ages

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