These metaphors describe various stages in the transformation of human consciousness. For Nietzsche, nothing is static; all is in flux and becoming.
A camel is a beast of burden. It accepts a load and goes days through the desert without water. The camel-image seems to refer to the human tendency to confront the difficult out of a sense of duty.
We are constantly becoming writers.
Then the lion-like spirit takes over. The creative freedom arises as a writer discovers confidence and rebels.
The lion becomes a child. A return to innocence energizes. Now the writer can engage in original ideas without restraint.
We may need to shuttle back and forth in the progression to gain the most in our writing.
Creative Write: Have you gone through this process as a writer from obedience through reaction to a child's wonder? Where are you in the process? Do you risk and struggle with uncertainty?
Develop a metaphor to describe your trip through camel and lion to child.