 So far, this text has described different ways in which a multi-modal system can emerge. We have briefly discussed how a single modal system can give rise to a multi-modal one by providing either syntactic or semantic definitions of new concepts  (section 2),  and also how two or more modal systems can be combined in order to produce a multi-modal one  (section 3).  As the provided examples have shown (and the examples in  section 4  will continue to do), the addition of modalities allows us to establish and/or find significant relationships between the involved concepts, thus providing a better understanding of what each one of them is.