import matplotlib.pyplot as plt
import numpy as np

n = 1024
X = np.random.normal(0,1,n)
Y = np.random.normal(0,1,n)
T = np.arctan2(Y,X)

plt.scatter(X,Y,s = 75, c = T, alpha=.5)
plt.xlim(-1.5,1.5)
plt.xticks(())
plt.ylim(-1.5,1.5)
plt.yticks(())

plt.show()
