IN A famous lab trial, a chimp named Sultan put two interlocking sticks together and pulled down an elusive prize, a bunch of bananas hanging just out of arm's reach.
Nearly a century later, eager tourists have conducted their own version of the experiment. Equipped with the camera extender known as a selfie stick, occasionally referred to as "the wand of narcissism", they can now reach for flattering CinemaScope selfies wherever they go.
Art museums have watched this development nervously, fearing damage to their collections or to visitors, as users swing their sticks with abandon. Now they are taking action. One by one, museums across the US have been imposing bans on using selfie sticks...