HOW IT WORKS

1. Even though the ball weighs a 30 KG to 30000 KG, even a small 

child can change the course of it and send it into an accelerated 

spin. There are no belts, pulleys or wheels used to make the

ball spin. It is floating on water. 

2. The sphere/ball made two key elements: the ball itself and

the base  it sits in. Cutting these two is a very complicated

process as any large differences between the contours of

them will prevent the ball from turning properly or sitting

in the socket. The two pieces are machined at the same

time to ensure any differences between them are minute.

When finished and the ball is placed in the socket, the

space between the two will be less than the thickness

of a business card. 

What to do: See if you can spin half a ton of granite!

What happens: You can spin the granite ball because it is floating

on water. The water pressure is only about 3 pounds per square inch

in the gap between the ball and the cup. There are enough square

inches for this pressure to hold up to 1200 pounds of granite!

3. The sphere/ball/globe is made from granite/marble/hard rocks, a type of igneous rock. The word ‘igneous’ means ‘made

from fire or heat’. Granite forms when molten rock (known as magma) below the surface

of the Earth cools very slowly. As it cools, the magma turns into solid rock. The

granite contains coarse grains of crystals, such as quartz. It is its appearance

that gives granite its names, as it comes from the Latin for ‘grainy’. Granite

forms a large part of the continental crust and can be found in many

mountainous regions around the world. Because it is so hardwearing

and tough, granite is widely used in construction.

4. Water is pumped up from beneath the socket. This

lubricates the sphere and puts pressure on it, forcing it to turn

gently. Once the ball has begun to revolve, it will continue to

do so until the water is shut off. 

5. The pressure of the pump in this exhibit

is very very low, at 3 pounds per square

inch (psi). Other large spheres operate at higher

pressures, between 14 and 21 psi. This is in

comparison to, for example, tyre pressure, 

which can be between 26 and 34 psi. if you want to buy just email on samratbhati@gmail.com