Gravity hill

Magnetic Hill, New Brunswick

Magnetic Hill-Moncton-New Brunswick-20170620

Gravity Hill is a geographical phenomenon where a slight downhill slope appears to be an uphill slope due to the layout of the surrounding land. This optical illusion makes it seem as though objects, including cars in neutral gear or balls, roll uphill against gravity. Gravity hills can be found in various locations around the world and often become local tourist attractions due to their peculiar nature.

Overview

A gravity hill occurs due to the optical illusion created by the horizon line being obscured or non-existent. Without the horizon as a reference point, it becomes difficult for observers to judge the slope of a surface accurately. Trees, walls, or other landmarks can exacerbate this illusion, making the slight downhill appear as an uphill slope. The phenomenon is purely perceptual, and the laws of physics remain unbroken; objects are not actually defying gravity but are instead rolling or moving downhill.

Scientific Explanation

The scientific explanation behind gravity hills lies in the misperception of the true layout of the surroundings. The brain uses multiple cues, such as the horizon, to determine the orientation of objects in the environment. When these cues are distorted or obscured, our perception of slope can be significantly altered. Researchers have studied various gravity hills, using surveying equipment to confirm that the "uphill" direction is, in fact, a downhill slope.

Locations

Gravity hills are found worldwide, often marked by local signage and sometimes used to promote tourism. Notable locations include:

• Magnetic Hill in New Brunswick, Canada
• Electric Brae in Ayrshire, Scotland
• Spook Hill in Lake Wales, Florida, USA

Each of these sites has its own local lore and explanations, ranging from magnetic fields to supernatural forces, though the true cause is the optical illusion created by the landscape.

Cultural Impact

Gravity hills have a significant cultural impact in the regions where they are found. They are often the subject of local legends and myths, involving magnetic or supernatural forces. These sites attract tourists, contributing to the local economy and providing a sense of mystery and wonder.

See Also

• Optical illusion
• Tourist attraction