:Maester Luwin [had] built a little pottery boy and dressed him in Bran’s clothes and flung him off
:Maester Luwin [had] built a little pottery boy and dressed him in Bran’s clothes and flung him off the wall into the yard below, to demonstrate what would happen to Bran if he fell. That had been fun, but afterward Bran just looked at the maester and said, “I’m not made of clay. And anyhow, I never fall.” -- source link