Ellis threw his cookingclass

Through the Looking-Glass, and What Alice Found There by Lewis Carroll ("loose carollaries").

A. J. Ellis – Algebra Identified with Geometry

Lewis Carroll was a mathemetician, he wrote A Syllabus of Plane Algebraical Geometry and taught the subject at Christ Church College, Oxford, from 1856 until his death.

Through the Looking-Glass contains many mirror themes, including opposites, time running backwards etc. In the book Alice ponders what the world is like on the other side of a mirror, and to her surprise, is able to pass through to experience this world. She discovers a book with looking-glass poetry, "Jabberwocky", which she can only read by holding it up to a mirror. http://en.wikipedia.org/wiki/Through_the_Looking-Glass

In the diagram of ALP the horizontal line AL is a mirror-axis between the upper and lower triangles.