Given different types of representation and different ways of thinking about them, it follows that there are likely to be different kinds of proof. In the enactive mode, proof is by prediction and physical experiment: to show two triangles with equal sides have equal angles, put them one on top of another and see. In the iconic mode, a picture is often seen as a prototype, that can be thought of as representing not only a single specific case, but others in the same class. The picture in figure 3, which demonstrates that four times three is three times four will work for any other whole numbers and so may be visualised as a generic proof that whole number multiplication does not depend on the order: