Wolfgang Köhler (1924) conducted experiments on chimpanzees. Köhler hang a banana from the ceiling in a room. There was also a box inside the room. Since the banana was hanging from the ceiling, it was impossible for a chimpanzee to reach the banana. However, after about 5 minutes what the chimpanzee did was amazing. The chimpanzee got the box, placed it properly to stand on it, stepped on it and finally jumped to get the banana. And it got it! After this experience, Köhler suggested that, chimpanzees solve problems in a flash of insight. It is like the ah-ha feeling. So, insight learning is also called ‘ah-ha experience’ because it occurs all of a sudden.