Task

Display a series of vertical color bars across the width of the display.

The color bars should either use:

   the system palette,   or 
   the sequence of colors: 
   black
   red
   green
   blue
   magenta
   cyan
   yellow
   white


ArrayPlot[
 ConstantArray[{Black, Red, Green, Blue, Magenta, Cyan, Yellow, 
   White}, 5]]