# open a window with 200x80
#####################################################################
-my $first = open_window($x, {
+my $first = open_window({
rect => [ 0, 0, 200, 80],
background_color => '#FF0000',
});
# Open a second window with 300x90
#####################################################################
-my $second = open_window($x, {
+my $second = open_window({
rect => [ 0, 0, 300, 90],
background_color => '#00FF00',
});