code: def plot_normal(norm, ax=None):
      if ax is None:
          _, ax = get_image_plot(norm.shape[1], norm.shape[0])
      norm = norm / 2 + 0.5
      ax.imshow(norm, interpolation="nearest")
  
file_path: kubric/kubric/plotting.py
imports: import colorsys
  import numpy
label_desc: Use image node_id 8 for calling a global function with example usage: plot_normal(norm, ax) without return types