Groovy: meaning of 'this' inside a closure

Question

The following example is adapted from \'Groovy in Action\'

class Mother {

    Closure birth() {                            
        def closure = { caller ->         


        

Answer 1

Sake says, "this is the closure not the object where the closure [is] constructed." But when we run this script, we find that this is a Mother, not a Closure.