This illustration demonstrates “the destructive effect of spectacle handles” for computer programs designed to automatically detect and measure the shape of a person’s ear. From one point of view, this shows that you are acting unfairly if you wear eyeglasses to an airport or bank or any other place where you are likely to be constantly monitored, measured and analyzed by technology.
It comes from the study “On Shape-Mediated Enrolment in Ear Biometrics,” Banafshe Arbab-Zavar and Mark S. Nixon, ADVANCES IN VISUAL COMPUTING — Lecture Notes in Computer Science, 2007, Volume 4842, 2007, pp. 549-558. The researchers are at the University of Southampton, UK
BONUS: A related study: Nixon’s “A novel ray analogy for enrolment of ear biometrics.” Here’s a detail from that study: