The Moon is a trickster,
shrouding herself in mystery
wrapped in the secrecy of clouds.
At times she appears to be
more a reflection of herself,
dancing on water
not suspended in the sky.
Tonight she is a tease
and dangles achingly low.
A cow forgets her gravity
and jumps over the Moon.
Suddenly the world is inverted
the sky is the sea, the air is water
and you're drowning.
The dish is your lifeboat,
the spoon is your oar
and you paddle against the current
of a universe turned over
as stars swim by like trout
shining in the river
and crayfish glisten on the rocks.
Well this was really inspired by a large number of Anne's poems. Specifically, I supose, the many poems she wrote about the classic fairy tales (such as "Briar Rose (Sleeping Beauty)", "Cinderella", "Rapunzel", "Red Riding Hood", and "Rumplestiltskin"). Anne seemed to love to take the familiar and comfortable, then twist it into something very ugly and uncomfortable. For instance, in "Briar Rose (Sleeping Beauty)", we find out that the father is a sexual predator at the end:
"It's not the prince at all,
but my father
drunkeningly bends over my bed,
circling the abyss like a shark,
my father thick upon me
like some sleeping jellyfish."
Kind of puts a damper on the ol' "Sleeping Beauty" fairy-tale, huh? I'll never look at fairy tales the same, thanks to Ms. Sexton. 
Read "Briar Rose (Sleeping Beauty)" and other Anne Sexton poems at Oldpoetry: http://oldpoetry.com/opoem/11827-Anne-Sexton-Briar-Rose--Sleeping-Beauty-
In a way, this poem also symbolizes our current economic/political situation in the United States (and worldwide, as well). Everything seems to be a bit.... upside-down and dizzying. It's hard to tell which way is up and what is right, these days. A lot of people are drowning in what they thought was the safety of the sky, that's for sure.