Ghost bath is a type of bath in which we pretend to take a bath without water. It's like playing a game of pretend where we imagine that we are taking a bath. We can use imaginary soap, shampoo, and even pretend to splash around in the water, even though there is no water there. It's a fun way to pretend and use our imagination, but we don't actually get clean from it. It's just for pretend play.