The operators of the small site (which is about 150 feet (46 m) in diameter) claim at that location the laws of physics and gravity do not apply and provide a number of demonstrations in support of these claims, where water seems to flow upwards, people seem to be standing in slanted positions, etc.
The Mystery Spot is a gravity hill, a tilt-induced visual illusion. The illusion experienced by visitors results from the oddly tilted environment as well as standing on a tilted floor. Inside the tilted room of the Mystery Spot, misperceptions of the height and orientation of objects occur.
Even when people are standing outside on a level ground, the slant of the building in the background causes misperceptions as humans judge the height of people using the slant of the roof rather than the true horizon.
- Shimamura, A. P. & Prinzmetal, W. (November 1999). "The Mystery Spot Illusion and its Relation to Other Visual Illusions" (PDF). Psychological Science 10 (6): 501–507. doi:10.1111/1467-9280.00196.
- Mystery Spot official website (California)
- Video Tour of the Mystery Spot (California)
- Mystery Spot explained (SandlotScience.com)—this site contains explanation about how Mystery Spots work, including a list of mystery spots
- Further article explaining the illusion (Berkeley.edu)
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