Not in looks, but in action, the model must resemble an animal. Therefore it must have these or some measure of these attributes: exploration, curios… - William Grey Walter

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Not in looks, but in action, the model must resemble an animal. Therefore it must have these or some measure of these attributes: exploration, curiosity, free-will in the sense of unpredictability, goalseeking, self-regulation, avoidance of dilemmas, foresight, memory, learning, forgetting, association of ideas, form recognition, and the elements of social accommodation. Such is life.