docs: def toggle_shade(self, shade):
          """This method will overlay a semi-transparent shade on top of the
          tile's image.
          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          Inputs:
              shade - This will designate which shade you wish to turn on or off.
                  Blue and red shades are available by default.
  
          (doc string updated ver 0.1)
          """
  
          # First toggle the user specified shade
          if self.shades[shade][0]:
              self.shades[shade][0] = 0
          else:
              self.shades[shade][0] = 1
  
          # Now draw the image with the active shades
          self.image.blit(self.pic, (0, 0))
          for key in self.shades:
              if self.shades[key][0]:
                  self.image.blit(self.shades[key][1], (0, 0))