Suggestion: "show figures with default backend"

Christoph Groth writes:

show_figures([Figure().add_subplot(1,1,1).plot(range(10)),
              Figure().add_subplot(1,1,1).plot([x*x for x in range(10)])])

This wouldn't work of course, it should be rather

f1 = Figure()
f1.add_subplot(1, 1, 1).plot(range(10))
f2 = Figure()
f2.add_subplot(1, 1, 1).plot([x*x for x in range(10)])
show_figures([f1, f2])