Ever since I posted this, I've been trying to decide exactly what it is I'm asking I think what I'm asking is whether there are exercises to help develop your imagination, just like drawing circles helps develop your hand coordination, drawing boxes helps develop your perspective etc. For example, when I watched the Harry Potter movies I thought, "Wow, the world they have created -- the rooms, the landscape, the background scenery -- is so much bigger and complex than the world I imagined as I read the books."
How do you go about fleshing out and populating the imaginary world you are creating so that it has real depth and complexity? (And certainly not all stories require that depth but I'd like to try to stretch my imagination farther.)