Sign languages take advantage of the three-dimensional space for a plethora of purposes. This space is used for referring to participants in a conversation, demonstrating the grammatical roles of participants in an event or illustrating information about different types of motion events.
Pronominal Usage Sign languages have some forms to refer to participants in a conversation (e.g. signer,
addressee, non-addressee). These forms strongly involve the usage of the signing space. By pointing towards his chest, the signer references himself. In some cultures where speakers of the spoken language point towards their noses to establish a reference to themselves, the nose is pointed to instead. Reference to the addressee or the non-addressee is done by pointing towards him or her. Index finger is used in these cases. In case of referring to plural participants, some sign languages may use other than the index finger. == Size of signing space ==