My favorite mirror dreams are ones where I successfully portal somewhere really cool. I quoted this one in my article because it's definitely up there (even though the start was really frustrating, it had a happy conclusion)."The door to my bedroom is closed so I tell myself there will be a field on the other side of it. But when I open the door... I just see the hallway, as I annoyingly suspected! I try again, closing the door and say 'there will be a sunny field on the other side THIS time', but it still doesn't work.
I leave the room, rubbing my hands together, checking they look normal (I keep seeing 5, then 6 fingers on my hands) and saying 10 + 10 = 20 to increase my lucidity. Then I see a mirror in the hallway and decide this is my chance to teleport. I feel more lucid now, and this time I approach it slowly, pushing my fingers through the surface of the mirror and it becomes liquidy.
I push further into the mirror and finally my eyes go through and I emerge into a big meadow with a train track running through the middle. It is WAY better than I imagined. The sky is romantic - purple, blue, pink and orange - and the fields are full of beautiful wild flowers. The hills are rolling which I had not expected and there are mountains in the far distance. I am overjoyed!"
Another cool portal method uses plain old doors - sometimes called "dream doors" because of their magic properties. Find a door in the dreamscape and imagine a whole different scene on the other side. Then open it, and often a new scene will be there waiting for you...
The first time I discovered this I just kept closing and opening the same door over and over, each time to be met with a different scene and some very puzzled looking people on the other side, from all different periods in time. It was so funny, I couldn't help testing my dream to see how many new scenes and rooms it could come up with on the other side. To all these door-world people, I was like a crazy time traveler popping in and out of existence