Why do sofas come in three sections, but not more?

When sofas come in two sections, they are called love seats, and when they come in more than three sections, they are called sectionals, but the sections are separate pieces. Why aren't there sofas that come in four sections, for example?

There are four and even five section couches though these days you would probably have to special order them. The three section couch became popular because it was a middle ground. Not to big for most rooms, and easier to move, it was more versatile. Today it has become an industry standard for those very reasons.

i wanna make a living room .suggest wch kind of sofas ,tiles ,furniture should i get with some web sites also?

wooden flooring is better than tiles? carving sofa is better than conceal sofa?which colour of walls should i takeand which polish i should keep for the furniture?kindly tell me some websites for decorated living room and dining room?

I like earth tones for the living room - very welcoming - so I'd suggest a wall color like Sherwin Williams "compatible cream" with "alabaster" for any trim and/or ceiling.
http://sherlink.sherwin.com/swapp/color_visualizer/index.jsp

Wood flooring, whether it's laminate or actual hard wood, looks much more rich & appropriate for the living room than tile. Then, you'll absolutely want to get a nice area rug. Rugs add color, texture & interest to the room:
http://www.homedecorators.com/Rugs/size/191/3×4_To_4×6/
If you do decice to paint the room cream, then you can choose any color, pattern, design of rug that you want, and then build the rest of your room from there.

There are so many options when it comes to living room furniture that I can point out some different options & their benefits, but ultimately, you just have to go with something that appeals to your sense of style.

Leather furniture - very durable, yet elegant. If this furniture is going to be getting a lot of use and/or if you have kids, then leather is a great option. The only drawback to leather it that it might not be the coziest if you like to occassionally curl up on your sofa for a nap:
http://www.homedecorators.com/Furniture/S/Leather_Club/

contemporary mircrofiber - fabric repels pet hair & feels great to the touch.
http://www.homedecorators.com/Furniture/S/Soho/
traditional microfiber:
http://www.homedecorators.com/search.php?search=cellini

Synthetic - comes in great colors, cleans easily, withstands a lot of abuse:
http://www.homedecorators.com/search.php?search=roma
http://www.homedecorators.com/search.php?search=morano

Here is a whole heap of links to HGTV living room makeovers that might give you some inspiration:
http://www.hgtv.com/hgtv/dc_design_living_area/0,1792,HGTV_3376,00.html
I like "A Family Room For Everyone" and "Contemporary Mediterranean."

What color should i paint my walls with a pink sheet & pink pillows?

I was going to paint my room pink so i have a pink sheet and a few pink pillows. Things in my room such as my futon bed and my vanity are black so i was wondering what color to paint my walls. I was thinking pink at first but now my parents are trying to tell me to go with an "accent" color that i can just put the pink with but im not sure. Any ideas?

So many things go with pink! It depends what your style is. I would go to a home store and get a pink paint chip in the shade closest to your sheets, and hold it against different colors to see what looks good to you.
I personally like pink with ivory for a feminine room, with green for a bright, cheerful space, or with browns for a more trendy look.
Like I said, it depends on your individual style and taste.

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How can I fix my futon mattress?

I've been using my cheap, metal futon only as a sofa since I bought my bed a few months ago, but it's becoming less and less comfortable. The mattress is slipping through the crack between the back of the futon and the seat, and no matter which way I turn it, it keeps doing so. This makes sitting in it more painful than relaxing and I often find myself sitting on the floor instead. Is there any way to fix my mattress?

No there is no way to fix it besides gettin a thick mattress pad or buy a new thicker mattress.

futons use full or twin sheets?

I have a regular futon, but I need to know if the sheets I need for it need to be full or twin, as I will be covering it with a fitted sheet

My futon uses full sheets.

i painted my living room a golden blond color now i am confused what color sofas to go with?

the color of my living room is a golden color. i also have some red's and greens in my home decor. any suggustions on what color sofas i should go with. or suggestion any websites i can visit would also be helpful.. thanks

Darker or natural colors. I would go with a cranberry color. My entire house from the living room to the bed and bath rooms are cranberry and gold. And in some rooms I use just a touch of brown