Originally Posted by
TheUncanny
My advice depends on what level of experience you have.
As a beginner, I'd suggest simply asking the dream permission to do what it is you'd like to do. The dream is you after all, or at least some part of you, and you might be surprised by how far showing a little respect and humility to that part of you will go.
As an intermediate, I suggest the more Judo-esque approach of redirecting the power of real-world expectations to assist you in completing fantasy-world tasks. Sivason used a good example of paint and it's real-world ability to be smeared/altered. I've also heard of people "swiping right" on a dream scene to change a dream setting as if it were merely the display of a mobile device. To keep it short, the key to this method is taking the thing you'd like to change, making an association between it and something that can be changed in the manner you desire in the real-world (and before you think about it too much) alter the dream thing in the same fashion you would if it were the real-world thing. Can't walk through a wall? Hmm, the wall is gray and so is clay. That wall IS clay, soft clay in fact, I'll just scoop a hole out of it and walk through!
As an advanced practitioner, it's an existential question, or rather existential recognition, that the dream world is not the real world, which is as simple of an idea as it is difficult to really (and I mean really) have sink in. And understandably so: the relentless pull of gravity, the solidness of matter, our physical limits as fleshy bodies...all of it is reinforced in our minds every moment of every day for our entire lives -- those are a hard expectations to really let go of even when you know you're in a dream.