On one occasion, the Buddha said to the monks this:
"No other form do I know, O monks, that so persists in obsessing the mind of a man as the form of a woman. The form of a woman persists in obsessing the mind of a man.
I don't get that either. From what I read, Dogen equates sitting with enlightenment - probably something to do with knowing when you're snoozing and when you're not - but it isn't that simple. as anyone who can see through the eyelids will testify, and it sure beats open eye surgery.