old_contents: from microbit import *
  
  hands = Image.ALL_CLOCKS
  
  #A centre dot of brightness 2.
  ticker_image = Image("2\n").crop(-2,-2,5,5)
  
  #Adjust these to taste
  MINUTE_BRIGHT = 0.1111
  HOUR_BRIGHT = 0.55555
  
  #Generate hands for 5 minute intervals
  def fiveticks():
      fivemins = 0
      hours = 0
      while True:
          yield  hands[fivemins]*MINUTE_BRIGHT + hands[hours]*HOUR_BRIGHT
          fivemins = (fivemins+1)%12
          hours = (hours + (fivemins == 0))%12
  
  #Generate hands with ticker superimposed for 1 minute intervals.      
  def ticks():
      on = True
      for face in fiveticks():
          for i in range(5):
              if on:
                  yield face + ticker_image
              else:
                  yield face - ticker_image
              on = not on
  
  #Run a clock speeded up 60 times, so we can watch the animation.
  display.animate(ticks(), 1000)
  
  
  
  
new_contents: from microbit import *
  
  hands = Image.ALL_CLOCKS
  
  #A centre dot of brightness 2.
  ticker_image = Image("2\n").crop(-2,-2,5,5)
  
  #Adjust these to taste
  MINUTE_BRIGHT = 0.1111
  HOUR_BRIGHT = 0.55555
  
  #Generate hands for 5 minute intervals
  def fiveticks():
      fivemins = 0
      hours = 0
      while True:
          yield  hands[fivemins]*MINUTE_BRIGHT + hands[hours]*HOUR_BRIGHT
          fivemins = (fivemins+1)%12
          hours = (hours + (fivemins == 0))%12
  
  #Generate hands with ticker superimposed for 1 minute intervals.      
  def ticks():
      on = True
      for face in fiveticks():
          for i in range(5):
              if on:
                  yield face + ticker_image
              else:
                  yield face - ticker_image
              on = not on
  
  #Run a clock speeded up 60 times, so we can watch the animation.
  display.show(ticks(), 1000)
  
  
  
  
subject: Use display.show instead of display.animate