Humor's always been a part of Raworth's poetics, but it's more than below the surface in Windmills in Flames. Take the first two stanza of "Envoi":
I could go on like this all day
Ti-tum ti-tum and doodly-ay
With every now and then a glance
To see if I've still on my pants
And if I have, if that stain's jism
Or just a trace of modernism.
For isn't this what poetry is?...
A raincoat over similes
You've seen before... FLASH...look again
The same. No need to strain your brain
Simply recline on the chaise lounge
And listen to the rhymes go bong.