“And sonograms distort reality in another, more subtle way: You can only take a picture of the embryo/fetus if you erase the body of the pregnant woman. As with the famous optical illusion of the duck-rabbit, you can’t see them both at the same time. In a sonogram the fetus is the subject, the woman is the background; the case for its personhood is made by turning her into gray-and-white wallpaper.”