Use 'take shape' when discussing the progress or development of something abstract, like a plan or idea. Her concept for the novel began to take shape after many brainstorming sessions.
Pro Tip 2/3
Clarity Over Time
'Take shape' implies that something is becoming clearer or more definite over a period of time. The team's strategy for the project took shape over several meetings.
Pro Tip 3/3
Uncertainty to Certainty
It conveys a transition from uncertainty to a more certain and understandable form or plan. As the discussion moved forward, a resolution started to take shape.