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Kohler who was born in Revel, Estonia and moved to the United States in 1935, did pioneering studies in the behavior of apes that showed the importance of perceptual organization and insight in learning His groundbreaking experiment involved one of his chimpanzees, Sultan Sultan had learned to use a stick to rake in bananas outside of his cage This time Kohler placed the banana outside of the reach of just one stick and gave Sultan two sticks that could be fitted together to make a single pole that was long enough to reach the banana After fiddling with the sticks for an hour or so, Sultan happened to align the sticks and in a flash of sudden inspiration, fitted the two sticks together and pulled in the banana Kohler was impressed by Sultan's rapid "perception of relationships" and used the term insight to describe it