When I first think that I could be dreaming, I stretch out onto the air, almost like taking a shallow dive into water, and when I glide easily through the air, I'm satisfied that I am indeed dreaming.
At some point I seem to be showing someone different modes of flying: hovering, floating, gliding, etc. We seem to do this indoors in a cafeteria-like place in a campus or some kind of institution, for quite a while. There are a few others around. I also show her how to pass through solid objects.
At some point there is a glass wall and either on the other side of it, or somehow embedded in it are silver pieces of metal (perhaps modern art - the structure doesn't seem to have a function). I purposely fly through it, only briefly entertaining the thought that I might not be able to do it. I pass through easily, not feeling anything. There is another structure, smaller, also seemingly embedded or behind a glass wall that I pass through with ease.
Your lucid dreams can educate and inform others about the joy, potential and practice of lucid dreams. Plus, you get to see your lucid dream printed in a lucid dream magazine!