The Tyger by William Blake is a poem exploring the nature of the Creator. Throughout the poem, the speaker lists attributes of the tyger and then poses a question about how such a thing could be made. For example, in the fourth stanza, the speaker says:
What the hammer? what the chain,
In what furnace was thy brain?
What the anvil? what dread grasp,
Dare its deadly terrors clasp!
Here, he is questioning what it would take, and who would be able, to create something that strikes fear into those who see it.
The fifth stanza closes on this line: "Did he who made the Lamb make thee?" This question helps to illuminate the purpose of the poem, as we understand that the speaker is struggling to believe that a Creator who could fashion something as peaceful and sweet as a lamb could also create something as powerful and deadly as a tiger.