Paradise
Adam and Eve lived in a perfect garden called Paradise before they ate from the forbidden fruit. The garden is described multiple times as idyllic and lacking nothing. The garden can be seen in this context as serving a metaphorical purpose as well. In fact, it is used here to represent the perfection one can achieve if they decide to listen to all God's commands.
The forbidden fruit
Another metaphor in the story about the primordial couple is the forbidden fruit. This element is present from the start and was put there by God himself when Paradise was created. The forbidden fruit is used here as a metaphor for the magnetic pull sin has on a person and its constant presence throughout a person's life. The author also transmits the idea that eating from the tree is a personal choice and as such, every person is responsible for the actions they will later have to deal with.
Metaphor for superiority
When God creates the Garden of Eden as a home for the first couple, he also created a large number of animals and plants. When the first human starts to inhabit the garden, he is told that everything he sees, is under his command to control and do with it as he wishes. Adam does not question his power and the right he has to rule over the living beings inside the garden and instead he just assumes the role of leader. The animals in the garden become at this point used as a metaphor, representing man's superiority. Throughout the play, this superiority is never challenged, and as such man remains the undisputed ruler.
Metaphor for life
After killing his brother Abel, Cain tries to do everything he can to hide his actions. Predictably, he is discovered almost immediately by God who asks Cain what happened to his brother. Cain tries to deny his involvement and pretends he knows nothing about his brother's death. At that moment, God tells Cain that Able's blood is screaming to him and demanding justice. The blood becomes from this point on used as a metaphor and it is used by the author to represent, in this context, a person's life, and its value.
The eye
Towards the end of the play, the author presents in quick succession a large number of prophets trying to make the nation of Israel to turn back to God. The people are described in this instance as being sinful and unable to control their own urges. The reason for their behavior is identified as being their "sinful sight". Thus, the eye becomes used here as a metaphor to represent the sinful tendency everyone has and which is at times hard to control.
