toyplot no worky

#!/usr/bin/env python

import numpy, toyplot

x = numpy.linspace(0,10)
y = x ** 2

canvas = toyplot.Canvas(width=500, height=500)
axes = canvas.axes()
mark = axes.plot(x, y)

# need a line here like e.g.
# mark.show()   ??? as is in numpy/pyplot ??