Answer:
Lamb is a symbol of innocence, the tiger is a symbol for experience maybe danger.
The tiger causes fear in those who see its power. While the lamb has serenity.
The last line is a question. The speaker in this poem realizes that not all questions can be answered.
When it asks all these questions it is about the tools used to construct the wild creature that is the tiger.
Explanation:
The “burning bright” in line 1, immediately followed by a reference to “forests of the night” in line 2, makes me think of flickering light---the light of innocence becoming diffused by experience or tiger.