new_contents: """
  ============
  Figure shape
  ============
  
  Often, you want to adjust the shape (or aspect ratio) of a figure, but you
  don't want to explicitly calculate its size. Matplotlib provides a function
  called ``figaspect`` to fill this role. To adjust the aspect ratio of the
  figure, ``plt.figaspect`` will change the *width* of the figure.
  ``layout.figaspect`` will, instead, change the *height* of the figure.  This
  behavior is convenient if you have a fixed-width requirement (e.g., the width
  of columns in a journal page or the width of a web page).
  
  """
  import numpy as np
  import matplotlib.pyplot as plt
  
  from mpltools import layout
  
  
  x, y = np.random.normal(size=(2, 20))
  
  aspect_functions = {'mpltools.layout.figaspect': layout.figaspect,
                      'matplotlib.pyplot.figaspect': plt.figaspect}
  
  for label, figaspect in aspect_functions.items():
      figsize = figaspect(0.5)
      fig, ax = plt.subplots(figsize=figsize)
  
      ax.plot(x, y, 'ro')
      ax.set_title(label)
  
  plt.show()
  
subject: Add example of `figaspect`.