Language Point 33

...the rush and roar soon took musical shape within his brain. (Para. 4)
Meaning: The image and sound of the rush and roar of the violent ocean became clear in a musical form in his brain.
take shape: develop or start to appear in such a way that it becomes fairly clear what its final form will be
After several days' discussion, their project began to take shape.

经过几天的讨论，他们的项目框架开始成形了。