They help the actor eliminate stage fright and help in preparedness.
Cave paintings are evidence of artistic ideas, language, and (possibly) religious ideas as well.
Depending on where you are brought up, and the difference in society, you will see different things and people will have different beliefs in symbolism. For example, seeing a bird in a picture for a Christian may represent a dove and be seen as peace, but for someone else it may be seen as a vulture and represent death
