The Human Equation is the sixth album by Arjen Anthony Lucassen, released under the name Ayreon. It was released on May 25, 2004. As with other Ayreon albums, it features guest appearances from several musicians previously unrelated to the project, including James LaBrie of Dream Theater, Mikael Åkerfeldt of Opeth, Eric Clayton of Saviour Machine, and Devin Townsend, performing music arranged and written by Lucassen. Concept and storyline The album explores the idea of psychological rebirth, and follows the story a man who, after falling into a coma following a car accident, is confronted with his past, his emotions, and his current situation as he lays trapped inside his own mind. The circumstances surrounding the accident are mysterious, as the man ("Me", portrayed by James LaBrie) ploughed into a tree on a deserted road in broad daylight. Following this, he slips into a twenty-day coma, with each day represented by a single song. Each song follows a slightly different format, though there are major common themes, such as the presence of Me's manifest emotions in his dream world (including Fear portrayed by Mikael Åkerfeldt, Reason portrayed by Eric Clayton, and Pride portrayed by Magnus Ekwall); the presence of Me's Wife (Marcela Bovio) and Best Friend (Arjen Anthony Lucassen) at his bedside; and the past events that Me is forced to reflect on. The plot builds from Me’s early broken state to his eventual rebirth as a new and better man. His own dark past; in which he su