A maths teacher at a high school in Maine, USA has been allowed to keep her pink Hello Kitty Christmas tree in her classroom. The tree was made from pink plastic and was adorned with Hello Kitty ornaments. The teacher, Catherine Gordon, had earlier been ordered by the school principal Paul Butler to remove it after he decided it was an "inappropriate" Christmas decoration. Mr Butler explained to ABC News that he initially believed the tree did not fit with the way the school celebrated the different religious events happening at this time of the year. He said: "A concern was shared with me regarding an inconsistency with our balanced approach to holiday observances.