whether it's as a temporary tattoo

or at a Chinese temple.

It's called the yin-yang symbol.

It comes from Taoism,

a religion born in China

and it has far more meaning than you probably realize.

The yin is the dark swirl,

and the yang is the light one,

and each side has a dot of the opposite color,

which gives a clue to the meaning of yin and yang.

Everything contains the seed of its opposite.

Darth Vadar has the seed of goodness,

and Luke has the potential to follow

his father to the dark side.

Like Luke and his father,

yin and yang are not total opposites,

they are relative to each other.

Taoists believe that the universe is made up

of energies, vibrations, and matter,

which behave differently

in different contexts.

Something can be yin or yang

depending on,

well, depending on lots of things.

So, while wheat that's growing is yang,

when it's being reaped, it's yin.

A wave's crest is yang,

and the trough is yin.

Villages on the sunny side of a valley in China

have names like Liuyang or Shiyang,

but on the shady side, for example,

of the Yangtze River Valley,

there's Jiangyin.

The brake is yin to the gas pedal's yang.

An eggshell is yang,

the egg inside is yin.

You think you're getting it?

Yang is harder,

stronger,

brighter,

and faster,

but one can turn into the other

or are two sides of the same coin.

The sunbeams are yang

in comparison to the shadows.

The pitch is yang,

the catch is yin.

The yang starts an action,

and the yin receives it,

completes it.

Yin is the inside space of a cup;

it wouldn't be a cup without it.

Yang is the cup.

The coffee's heat, however, is yang,

and its blackness is yin.

Yang goes berserk sometimes,

but there's some very powerful yins, too,

if they don't quite go berserk.

Yin is the darker swirl, the female,

but there is a white dot in it.

And yang is the lighter, the male,

but it has a black dot.

Water flowing calmly in a river is yin,

but when it goes over the waterfall,

it's very yang.

Toothpicks are yin

compared with a telephone pole.

The back of a person is more yin

than the front.

The top of a person is the yang end.

Taoism teaches that there is a power in the universe.

It's higher, deeper, and truer than any other force.

They call it the Tao.

It means the way.

Like the Force in Star Wars,

the Tao has two sides.

Unlike other religions where the higher power is all good,

and perhaps has an all-evil rival,

Taoism teaches that we need to learn

from both yin and yang.

And unlike religions with gods that are personal,

the higher power in Taoism is not.

Taoists believe that living in harmony with the way,

a person will not have to fight

against the universe's natural flow.

So, for example, listen more,

argue less.

Be ready to back up or undo something,

and you will make even faster progress.

Don't worry about being the best,

be who you are.

Live simply.

Complications take you away from the Tao.

"The wise person is flexible," Taoists say.

Learning to use the Tao

is what Taoism is all about,

and that's why you should know

your yin from your yang.