http://www.mysteryspot.com/ How do you explain what you experience there? I understand it's all optical illusion. I can explain - people walking on the wall, pendulum swinging at an angle - is just a slant-walled house. The thing I could not explain is the relative height difference they demonstrate. The ask 2 people of different height to stand on a beam. Then they swap their position - the taller guy looks shorter and vice versa. The beam is not inclined - they prove it with a spirit level. Also, they show a rubber ball rolling upwards in a wooden rail. With a spirit level, they show the wooden rail is not slanted.