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The centrepiece of AIBO is its intelligence. With the artificial intelligence mind, AIBO now has a personality. AIBO is capable of six feelings - happiness, sadness, fear, dislike, surprise, and anger. Its unique personality is developed with a combination of these unique instincts and feelings. By interacting with people, AIBO learn and grows. AIBO's mood and behavior changes with its environment. AIBO also has instincts to move around, to look for its toys, to satisfy its curiosity, to play and communicate with its owner, to recharge when its battery is low, and to wake up when its done sleeping. There are 28 LED lights on the Illume-face display, and by changing the pattern of lights, various expressions and feelings can be indicated, and complex animations can be displayed. Feelings, like joy, sorrow, anger can be displayed with vivid color and movement. Depending on its mood, AIBO can also flap it ears up and down, and wag its tail. When it hears something AIBO will analyze the sound and recognize words. The direction of the sound came from is also perceived and AIBO will turn his head toward the source.