The primary qualities are those such as weight, shape, size and movement. Secondary qualities are colors, tastes, sounds, smells. Frank Jackson explained that the very existence of secondary qualities promotes the idea of ​​dualism. He states that science allows us to recognize and understand that there is no color in physical or material things. The color we see corresponds to the “sensory data” that is collected. The very interpretation of things like color or smell shows that there are thoughts and ideas that cannot be defended by the material explanations that science can give.