{'pixelToPixelSpacing':'pixelToPixel spacing not defined in argDict.  This is the
length of wire between 2 adjacent LEDs.  Common values are 4 or 12.
Specified in config XML.', 'numPixels': 'numPixels not defined in
argDict.  Common value: 50.', 'originLocation':'originLocation not
defined in argDict.  Values should be a string in the form (x,y).  This
should be specified in the config XML.'}