new_contents: size = 7
  m = [[0] * size for _ in range(size)]
  start = size // 2
  total = size * size
  current = 1
  
  i = j = start
  direction = 0
  current_leg_length = 1
  leg_length_now = 0
  current_leg_count = 0
  
  while current <= total:
      m[i][j] = current
      current += 1
      leg_length_now += 1
  
      if direction == 0:
          j -= 1
      elif direction == 1:
          i += 1
      elif direction == 2:
          j += 1
      else:
          i -= 1
  
      if leg_length_now == current_leg_length:
          leg_length_now = 0
          direction = (direction + 1) % 4
  
          if current_leg_count == 1:
              current_leg_length += 1
              current_leg_count = 0
          else:
              current_leg_count += 1
  
  for i in range(size):
      print(m[i])
  
subject: Add program populating matrix with numbers starting with 1 in the matrix center and then spiralling out