Top Down Desing & Bottom Up Design

Can someone help me with some Reference or an explanation to Top Down Design % Bottom Up Design ?
I was reading about this in Jumping in C++ by Alex Allain but I don't really understand what he want to say.
Can someone help me please ?
You start with the "big picture". Then you gradually dig into finer details. A director has a vision of a masterpiece movie. Then he has to come up with script, funding, casting, ...

You start by making small components. Then you build the bigger entity. Like playing with Lego or Minecraft; What can I do with these bricks?
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