Given Gestalt psychology's focus on the whole, it was natural for Gestalt psychologists to study problem solving from the perspective of insight, seeking to understand the process by which organisms sometimes suddenly transition from having no idea how to solve a problem to instantly understanding the whole problem and its solution. In a famous set of experiments, Köhler gave chimpanzees some boxes and placed food high off the ground; after some time, the chimpanzees appeared to suddenly realize that they could stack the boxes on top of each other to reach the food.