I second this. This is a really great concept to keep in mind. I used to struggle with making something appear out of nothing. I find that even if you are gifted at doing that, it makes your lucid dream more fun and more realistic if you create "explanations" for having things appear.

For example, if I'm being chased by zombies, I could easily just snap my fingers and make a shotgun appear, but I believe that your mind makes the dream more real when you choose not to overuse the "this is just a dream" mentality. So I might run through a shopping mall where there's a gun store, I break in and take a shotgun.

This, in my opinion, is coherent with BillyBob's explanitory post about passive versus active control in dreams. If you decide to do something with the simple logic that "this is a dream, I can do whatever I want," (which is, of course, true,) you may find that your subconscious responds to that mentality as a loss of appreciation for what is happening in your mind.

That's obviously not true for everyone, but it was true for me. I like this post. Well written, Cusp.