I dreampt that I was going for a bike ride from Madison. There was an interestingly paved highway that I was riding on, and eventually it ended and I wound up on a bike path through the country. I rode along on the bike path and pretty soon I was in Canada. I could tell because of the signs. There must be some space warping going on here because I certainly hadn't ridden the hundreds of miles you normally would have to ride to get to Canada from Madison. I kept riding and soon I was on a bike path in England (more signs, and people were riding on the wrong side of the trail). And I kept riding for a while because this was fun. Eventually it started getting dark and I was turning back. I asked a guy that looked like he would know what was going on where the 'wormhole' (I couldn't think of a better name for it) was, as I had never noticed going through any sort of gateway, so I didn't know exactly where it was that I had jumped from Wisconsin to Canada or Canada to England. He said that they had just filled it in, supposedly because it was causing too much trouble with the atmosphere *. That would be unfortunate, though, since I needed to get home and I didn't want to have to cross the ocean. But as I rode back I watched more carefully my surroundings and I found the place where things changed. It was like there was a semicircular wire going up into the air and back down on the other side of the trail, about 200 feet in diameter. The sky looked different on the other side. So they hadn't 'filled it in' after all. And I rode home.

Later I brought some friends with me to show them where you could go to Canada really easily. The sky looked darker on the Canadian side. There was another, smaller wormhole nearby. Things got screwed up when they went through that one. Like your skin would turn green. I decided to avoid it.

* Gateway Physics

In the dream I was thinking that England, being at a lower elevation than the part of Canada that the gateway was in, would have higher air pressure, and air would want to rush through the gateway from the side with lower elevation to the side with higher elevation. It wouldn't actually work this way because that would mean you could get free energy by putting a loop of pipe through the gateway and across the ocean - to an air particle going from England to Canada through the gateway and then across the ocean back to England, it would seem to be falling forever.

More realistically, if the Earth's gravitational field extended through the gateway, a biker going from Canada to England would be pulled through by gravity as if he were falling from the ground altitude at the gateway in Canada to that at the gateway in England, and air wouldn't rush from England to Canada because it would have to fight gravity to do so just as it would if it were going up and across the ocean.