Interactivity in drawing/writing gesture

How is hand gesture articulated in the use of human – computer interaction (HCI) ? What are the possibilities of hand/body gestures in interactivity, or how could HCI be developed for flexible drawing/writing gesture processes? In prehistoric times, drawing was an important way to communicate, representing traces that connect past, present and future. What was the reason for the first drawings to appear in humankind on the walls of caves? How does the message they communicate correspond to the contemporary information age? Is there anything in common between Paleolithic and the contemporary media technology society? How do these relations show significance and importance for technological development and data reading?