# Something which is often used

I am something which is often used.
I can be light blue, light red, or light green.
I can be put up or taken down.
But I am never in one piece.

Many people study my kind
Many more use us frequently
But there is one sure thing
You find us more than thrice in this question.
What am I?

Hint:

In the first set alone there are more than three of us.

• As no one has answered this riddle correctly yet, Can you please add a few more details to it? – Syeda Zunaira Apr 4 '17 at 7:14
• Seems like he left us: "Last seen May 19 at 13:00" =( – Cockabondy Oct 4 '17 at 15:16
• @Cockabondy I'm back! There is no correct answer yet, the closest is K. Styles's. – user_194421 Oct 12 '17 at 14:37
• @user_194421 Oh well, if it's something related to grammar, the I'm out :D My native is Ukrainian. It's kinda hard to get used to all wordings in English. – Cockabondy Oct 13 '17 at 8:18

Are you...

Light?

I am something which is often used.

Used in lasers, TV, computers, projectors...

I can be light blue, light red, or light green.

Light can be any color and can be divided in RGB components.

UV rays can cause cancer or hurt your eyes. Can be useful in many ways like tanning or removing hair permanently with lasers etc...

But I'm never in one piece.

Light is not tangible and is easily refracted.

Many people study my kind

Many kind of scientist have studied light, to make lasers, light speed, etc...

Many more use us frequently

Most of us watch TV, use a PC, smartphone or something that requires light!

But there is one sure thing, You find us thrice in this question.

Yup. 3 times.

• more than thrice, not thrice – NexusInk Jan 19 '18 at 22:14

Are you...

Conjugation words?

I am something which is often used.

We say them all the time

I can be light blue, light red, or light green.

I think green = and, red = but, blue = or
green = and because the components agree/complement each other and green is usually the color of affirmation
red = but because the two components contrast with each other and red is usually the color used to show disagreement
blue = or is a bit of a stretch, but the components can either complement or contrast and blue is a bit more neutral color

I can be put up or taken down.

But I am never in one piece.

You can either use them and join two sentences or take them down and break the sentence into separate ones. Sometimes this makes the sentence better and sometimes worse. The pieces are the parts it connects.

Many people study my kind

Many people study grammar

Many more use us frequently

Don't need to study them to say it

But there is one sure thing

You find us more than thrice in this question.

I think I count 5 uses.

• Welcome to Puzzling! This looks like a nice answer, but can you justify the red/blue/green = and/but/or correspondence? I would hope that symbolism like this would be more than just arbitrary in a decent riddle. – Rand al'Thor Mar 22 '17 at 22:38
• Sure, I'll edit my explanation to clarify it a bit more. – K. Styles Mar 22 '17 at 23:23
• It was edited from thrice to more than thrice after someone gave an answer for thrice. – K. Styles Mar 23 '17 at 5:14
• Clever thinking, but I can just change the colours and the answer will be the same. – user_194421 Mar 23 '17 at 6:43
• @boboquack You might need to clear your cookies ;) – Techidiot Mar 23 '17 at 7:37

Probably a bit of a stretch but could you be looking for

eyes?

I am something which is often used.

When ever they're open and working correctly.

I can be light blue, light red, or light green.

Pale Blue/Green eyes, and pink-eye?

I can be put up or taken down.

Can't think of a fit I'm completely happy with for this...

Eyes help with most things but you're eyes can 'hurt you', as in "My eye's are hurting!".

But I am never in one piece.

Eyes, plural, would refer to more than one eye, typically/commonly a pair.

Many people study my kind

Opticians etc.

Many more use us frequently

Sighted people

But there is one sure thing You find us more than thrice in this question.

There are multiple "I"s in the question.

Are you...

Traffic Signals

I am something which is often used.

I can be light blue, light red, or light green.

Color of Signals

If you dont follow the signals you can hurt or you need to wait so you are hurt . But of course they help us to avoid accidents

But I'm never in one piece.

there are always moe than one color of signals

Many people study my kind

it could be about any other kind of signala like electromagnetic

Many more use us frequently

we use traffic lights frequently

But there is one sure thing, You find us thrice in this question.

Yup. 3 times.

• Welcome to Puzzling. That's a nice first answer :) – ABcDexter Mar 22 '17 at 7:44
• Nice :-) One of my kinds may be talking about any other kind of signal like electromagnetic :-) – Techidiot Mar 22 '17 at 7:51
• I've never seen a light blue traffic light. – user_194421 Mar 22 '17 at 9:19
• @user_194421 They do exist, I know some countries use blue instead of green. – F1Krazy Mar 22 '17 at 9:28
• @user_194421 There are also special blue railway traffic signals in some countries – see Czech and Polish Wikipedia. :) – CiaPan Mar 22 '17 at 15:25

The last attempt went in vain when OP edited the riddle to make thrice as more than thrice which Brent has nicely found here

Another possibility,

You are a

CAN

I am something which is often used.

Often used everywhere.

I can be light blue, light red, or light green.

A can comes in many colors.

You may hurt your fingers while opening it, once opened, it serves with the inner fluid which makes you happy :-)

But I'm never in one piece.

Now a can may come with a straw, an opener and off course whatever it is filled in with.

Many people study my kind

Tin can's are mostly studied by the manufacturing industries.

Many more use us frequently

Yes, many do that.

But there is one sure thing
You find us thrice in this question.

Can appears exactly 4 times in the riddle.

The last line gave away the obvious answer already given by stackreader here but I came up with another possibility -

Are you

Colors

I am something which is often used.

Often used everywhere.

I can be light blue, light red, or light green.

All these are colors

Some colors can cause headaches and irritation in eyes

But I'm never in one piece.

Colors are formed of multiple things.

Many people study my kind

CHROMATICS is a study of colors. Things like color spectrum is studied by scientists, different colors are studied by artists across the globe.

Many more use us frequently

A lot of people use it quite frequently.

But there is one sure thing
You find us thrice in this question.

There are 3 colors in the riddle $\rightarrow$ light blue, light red, or light green.

I'm gonna try as well

Are you

A button?

I am something which is often used.

On the web the buttons are pretty much everywhere

I can be light blue, light red, or light green.

You can style your buttons (Bootstrap default buttons are light blue, light red, or light green)

Maybe that is because on SE if you press DownVote you lose 2 points, but if you get UpVote you gain 10 points. Anyway it is helpful to get feedback

But I'm never in one piece.

Not sure, but it could be that buttons have a lot of configurations? (Like hover, focus etc.)

Many people study my kind

Web designer have to study the buttons style and position to have a good graphic interface

A lot of people use it quite frequently.

Using buttons is a must on the internet. And on SE it is very important press the vote buttons to get feedbacks

But there is one sure thing You find us more than thrice in this question.

There is the upvote, downvote, favourite, share / edit / flag and more, which are anchor tag but used like buttons, i guess

• I mean in the text, not its surroundings. So the upvote, downvote, etc. don't count. – user_194421 Mar 22 '17 at 10:05

Air

I am something which is often used.

Obviously, we use it all the time.

I can be light blue, light red, or light green.

Colors of the sky(or air). Light blue during the day, light red during the sunset and light green is a reference to northern lights. The list doesn't include black since it's not a color.

Air keeps us alive, but it can also be poisonous(toxic gases)

But I'm never in one piece.

The composition of air consists of several gases, mainly nitrogen, oxygen, water vapor, argon, and carbon dioxide.

Many people study my kind

People studying Earth's atmosphere, weather etc.

Many more use us frequently

Obviously.

But there is one sure thing, You find us more than thrice in this question.

Air can also mean empty space. There are 6 spaces in just the first line of the question.

Hint

There are 6 spaces between the words of the first line.

You are

screen pixels

I am something which is often used.


on screen

I can be light blue, light red, or light green.


RGB color model

I can be put up or taken down.


Pixels are ligthed or not

I can hurt you, but I can also help you.


What you can see on a screen

But I am never in one piece.


One pixel alone is not a picture element, it's a picture

Many people study my kind


everyone who use color

Many more use us frequently


everyone who use a screen

But there is one sure thing
You find us more than thrice in this question.


What am I?

• According to of the comments: " Clever thinking, but I can just change the colours and the answer will be the same. – user_194421 Mar 23 at 6:43" – Cockabondy Oct 17 '17 at 13:32

Are you

a can?

I am something which is often used.

Cans are used often, such as containers

I can be light blue, light red, or light green.

Cans do have different color

Metal cans can hurt you because the edges do cut, but usually are helpfull to contain food or other materials

But I'm never in one piece.

There is the body of the can and also the top to close it

Many people study my kind

People do study cans to have a better quality, i suppose

A lot of people use it quite frequently.

Most of the people do use it as food container (canfood)

But there is one sure thing You find us more than thrice in this question.

You wrote the word 'can' four times only in the first set alone

• Oh, I already answered that here – Techidiot Mar 23 '17 at 18:58
• @Techidiot ops, didn't notice, i'm sorry – Dr. Roggia Mar 23 '17 at 21:36

What am I?

The words I CAN

I am something which is often used.

The words I CAN are used together quite often

I can be light blue, light red, or light green.

These two words may come in many colors as print or type face.

I can be put up or taken down.

Two options here, either lowercase and uppercase characters being put up and taken down. Or the two words put up on a post of somekind then later taken down.

Saying the two word I CAN may hurt you. For example, I CAN jump over that fire... In turn, the two words may also help give you the courage to succeed with a challenging task.

But I am never in one piece.

The words always has a space between the I and CAN.

Many people study my kind

Many people study words an grammer.

Many more use us frequently

They are said together by many people quite often.

But there is one sure thing You find us more than thrice in this question.

The two words I CAN appear together 4 times in the riddle.

Shot in the dark... Great riddle.