In Mesoamerican art speech scrolls emanate from the mouth and extend as though thrust form the throught with vocalization. The words are breathed out.
There are many examples of this with threatening speech scrolls ment for enemies.
Speech scrolls were used on monuments, murals, pottery and codices (screen-folded books).
Mesoamerican cultures believed that through death comes life. Sometimes the curled scrolls contain flowers, which would mean that a poem or song is being performed.
From the Internet
Aztec Codex Boturini, Fig. 11, p. 39, The Road To
Aztlan, Fields and Zamudio-Taylor, 2001.