Most magic tricks require a fairly sophisticated understanding of how humans perceive the world. To fall for a trick, people have to see things they perceive as important and ignore things that are ...

To help pay for his undergraduate education, Elias Garcia-Pelegrin had an unusual summer job: cruise ship magician. “I was that guy who comes out at dinnertime and does random magic for you,” he says.

A small experiment using sleights of hand and illusions offers insights into how birds and people perceive the world. By Veronique Greenwood The coin is in the illusionist’s left hand, now it’s in the ...