Generates a nervous grid that varies according to different randomised parameters: GridMode (2, 3 or 4 columns); Number of lines on each column (between 1 to 50); Hue (between 100 and 230); Brightness (0,60,100); There is a 20% change of getting a BW grid (brightness 0); . On this second iteration of NervousGrid the columns width are constantly changing. Hit "SPACE" to stop/start flickering