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With a road sign and some geometric shenanigans, the Nine Square Chair was born on a garage floor in Baltimore in early March. After making the Four Square Chair (https://www.instructables.com/you?show=INSTRUCTABLES&sort=ADDED&limit=10&offset=10) and the Flagman Table (https://www.instructables.com/id/Flagman-Table/), I thought of a way to combine the two.

The Flagman Table is made of a sign on a frame, which is a little bit cheap -- it avoids the challenge of using the sign structurally, and doesn't have the purity of concept that something made only from the sign would have. The Four Square Chair was based on a geometry of four squares, as the title suggests. Classical architecture, especially in plan, was derived, generally speaking, from a four-square grid: bilateral symmetry. Modern architecture was/is derived, generally speaking, from a nine-square grid, which allows for asymmetry.

A road sign 48" to a side breaks down neatly into a nine-square grid of 16" squares. Seat height for side chairs is usually in the 16"-17" range. I made a bunch of 1" to 12" scale models out of cereal box cardboard before I settled on a form that would turn into a chair without the need to add anything for bracing or stiffness -- purity of concept. I made a full-size mock-up out of cardboard to make sure of all the dimensions and folding sequence, then worked on the sign.

This bad boy is 100% recycled except for fasteners, and is virtually waste-free in its construction. Later in the instructable there is a picture of all the waste generated win the process, and it was only one dustpan full of aluminum shavings, which are recyclable.

For sale here: http://www.etsy.com/view_listing.php?listing_id=22009253

Step 1: Mock-Up

This sequence of steps shows the general layout and folding sequence of a cardboard mock-up. Lay out with a marker or pencil, starting with a grid of nine 16" squares. Number the grid to keep track of pieces as you begin to fold.

To hold the chair together, triangular fins are positioned such that adjoining squares will have overlapping fins, which can be through-bolted to hold it. For the model, use brads or stapels. This folding scheme is one of many possibilities using this general geometry and working method, so you may want to explore other designs.

Cut slits where appropriate, and perforate the seams that need to be folded. Then, fold squares seven, eight, and nine under squares four, five, and six. Pin seven to four, eight to five, and five to six. Fold 7/4 and 5/6 up ninety degrees from 8/5. Bend out the triangular fins from seven, eight, and nine, and they should overlap. Pin through them to secure the legs.

Flip the chair over and bend up the back and pin it by joining the fins from squares two and five.

<p>It's like origami with metal. Do you make these and sell them? There is an art museum near me that sells sign furniture that is remarkably similar to this. Chairs, small tables, etc.</p>
Where do you get your signs?
I am having trouble telling which lines to cut and which to fold.
Very cool! hope to give this ible a try. We have two seasons here winter and construction so there has to be lots of signs around.
Baltimore FTW :]. Anyways I love the idea, props on it.
Nice. Great idea
VERY NICE ! THANKS, I ' LL TRY !
What are the dimensions for this sign?
any ideas on gettign sighns?
Very cool upcycled chair!
this is pretty great. ima go find me a road sign... my friend's father is in city construction so i might have a possible link! woot!
Could you do this with corrugated plastic instead of sheet metal signs? This must be a very big sign and I would feel uneasy about taking it, but estate agents and others often leave corrugated plastic sheeting around.
Good design!
wow this is nice<sup>now where is the road i need some signs</sup><br/>you should try to roll the edges<br/>

About This Instructable

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Bio: Furniture hacker. Author of Guerilla Furniture Design, out now. Find me on Twitter and Instagram @objectguerilla.
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