Selena has a dog at home, so she knows about dogs. She is walking down the street and sees an animal walking toward her. The animal has four legs, fur, and a tail. Selena knows that these are characteristics of dogs. But the animal coming toward her is meowing, not barking. Selena's mom tells her that the animal is a cat. Now when Selena sees an animal with four legs, a tail, and fur, she will conclude it is a dog if it barks and a cat if it meows, illustrating Piaget's concept of: