Teen Phrenology Head Mug. Throughout the ages, one of the greatest mysteries has been the functioning of the adolescent mind. In honor of all the attempts to understand the teenage brain, we proudly present the Teen Phrenology Mug. Afterall, while Phrenology is a defunct science, we still have no clue to the adolescent personality. A great for any one who enjoys psychology and is associated with adolescents. Exclusively designed by the artist Kristin for The Psychology Shop.