Stephen Downes

The headline is overstated, but the details in this short article are no less interesting for it. In a nutshell, people differ in the way they place objects in their field of vision. "For example, when glancing at a coffee cup on a table, can two people agree on its exact position and whether its handle is big enough to grip? The result of a series of experiments suggest not." Each person, suggests the article, "has a unique visual fingerprint." Here's the full study from the Royal Society.