What is the imagery in The Tyger?

Firey Imagery is used throughout the poem in order to create emphasis on Blake's question of " Why would he who create the tiger also create the lamb?" Examples of the imagery appear in line 1 " burning bright" line 6 " Burnt the fire of thine eyes?" Line 14 " In what furnace was thy brain?" and all of stanza 4 which is a resemblance to forging.