docs: def plot_places(self):
          '''Plot places (in the parameter space) of all the generated artifacts
          and the artifacts accepted to the domain.
          '''
          from matplotlib import pyplot as plt
          fig, ax = plt.subplots()
          title = "Agent places, artifacts and env artifacts ({} env artifacts)".format(len(self.artifacts))
  
          x = []
          y = []
          for a in self.get_agents():
              args = a.arg_history
              x = x + [e[0] for e in args]
              y = y + [e[1] for e in args]
          sc = ax.scatter(x, y, marker='.', color=(0, 0, 1, 0.1), label='agent place')
  
          x = []
          y = []
          for a in self.get_agents():
              arts = a.A
              for ar in arts:
                  if ar.self_criticism == 'pass':
                      args = ar.framings[ar.creator]['args']
                      x.append(args[0])
                      y.append(args[1])
          sc = ax.scatter(x, y, marker="x", color=(0, 0, 1, 0.3), label='agent artifact')
  
          x = []
          y = []
          for a in self.artifacts:
              args = a.framings[a.creator]['args']
              x.append(args[0])
              y.append(args[1])
  
          sc = ax.scatter(x, y, marker="x", color='red', label='env artifact',
                          s=40)
          ax.set_xlim([-200, 200])
          ax.set_ylim([-200, 200])
          ax.set_xlabel('r')
          ax.set_ylabel('r_')
          ax.legend(loc='center left', bbox_to_anchor=(1, 0.5), fontsize=10)
          ax.set_title(title)
          plt.tight_layout(rect=(0,0,0.8,1))
  
          if self.logger is not None and self.logger.folder is not None:
              imname = os.path.join(self.logger.folder, 'arts_a{}_i{}_v{}.png'
                                    .format(len(self.get_agents()), self.age,
                                            self.voting_method))
              plt.savefig(imname)
              plt.close()
          else:
              plt.show()