How does William Saroyan use imagery in The Time of Your Life?

Imagery (Stage Direction)

[Willie] stands straight and pious before the contest.
Himself vs. the machine. Willie vs. Destiny. His skill
and daring vs. the cunning and trickery of the novelty
industry of America, and the whole challenging world.
He is the last of the American Pioneers, with nothing
more to fight but the machine, with no other reward
than lights going on and off, and six nickels for one.
Before him is the last champion, the machine. He is
the last challenger, the young man with nothing to do
in the world . . .