Trompe L'oeil, or Trick of the Eye, is a textbook by Duke Sir Patrick Devilin of DarkWrath Keep on advanced SCA fighting techniques. Originally published in 1999, the book is in its second edition as of 2011 and is 230 pages long.
Duke Patrick teaches fighting from a physics and stagecraft perspective, drawing on his real-life experience as a stage magician and designer of animatronic characters and creatures. He analyzes the physics of weapon movement, emphasizing energy and momentum principles, and discusses the psychology of weapon and shield placement and handling to deceive one's opponent in combat, hopefully creating openings for an attack.
This is an advanced text, intended for intermediate to experienced SCA armoured combatants.