Answer:
The image of the lamb contrasts with the fierceness of the tiger.
Step-by-step explanation:
The lamb is an archetype in literature because this animal has long been associated with the idea of innocence and purity. This is also the role that the lamb plays in this poem. When Blake introduces the tiger, he emphasizes its fierceness and wonders who could have create such an animal. He then wonders if the same mind could have also created the lamb. The implication is that the lamb is completely different to the tiger in the fact that it is sweet and innocent as opposed to fierce.