Abstract information uses words to describe concepts to stand for ideas, rules, theories, principles, emotions or the properties of objects that cannot be perceived such as electricity, molecules, or art appreciation. Abstract information is conveyed by words and ideas in the absence of material objects. When the effects of motor actions are perceivable, understanding the cause requires comprehension of an idea, such as electricity. Gravity is a concrete idea because the cause and effects are perceivable. Electricity is abstract when the effect is perceivable but the cause is not, e.g.