Forty five inch squares come out of one pack and go on the table, and the whole runner is decided right there, before a single seam is sewn. They get paired two by two, each pair becomes two units with a diagonal running through them, and whether the finished piece has any life in it comes down to one thing: how much value contrast sits inside each pair. Not which colours look pleasant together. How far apart they are on the scale from light to dark.
Colour is the part of this that lies to you. Two fabrics can be plainly different, a soft green and a dusty rose, and sit at almost exactly the same value, and the moment they are sewn together on the diagonal the line between them goes quiet and the unit reads as one flat shape. Value does not lie, but it is genuinely difficult to see while the colour is still in front of you, because the eye keeps reporting on hue when you are asking it about lightness. The way around that is to take the colour away. Lay the whole set out, photograph it from above, and convert the photograph to black and white. The camera has no opinion, and in greyscale the pack sorts itself: what was ambiguous a moment ago is now obviously light or obviously dark.
With the picture in front of you, split the squares into two piles, lights and darks, then count them. The counts need to match, because every pair takes one of each, so twenty and twenty is the target. Move pieces across until they do. The ones that make this interesting are the squares sitting on the fence, the mediums that could be argued either way, and those are settled by what they end up next to. A medium reads light beside a dark and dark beside a light, so you assign it to whichever pile is short and let its partner do the work of making it legible. Only when both piles are even does the pairing itself happen, and by then it is a matter of putting one hand in each pile, because the hard thinking is already finished.
Then a detail at the machine that decides whether all of that survives into the finished units. The diagonal gets marked on the back of the lighter square, corner to corner, using a ruler with a forty five degree diagonal line so the mark sits true. The seams go either side of that line, and here is the part worth knowing: stitch just inside the line rather than right up against it, taking a deliberately scant seam on each side. The pencil mark has a thickness of its own, and sewing exactly on it gives that thickness away twice, once on each side, which is enough to hand you units that come out too small to trim to the size you wanted. Shortening the stitch to around 1.8 goes with it, because each unit is about to be cut apart down its centre and trimmed along edges that are on the bias, and a shorter stitch holds all of that together while you handle it.
Pressing has an order to it as well. Press the unit closed first, exactly as it comes off the machine, before opening it at all. That is what settles the small wave of fabric that forms alongside a fresh seam and sets the stitches into the weave. Only then open it out and press the seam towards the darker side, which keeps the darker fabric from shadowing through and gives the seam a direction that will nest later on.
The last decision is composition, and it is worth giving it real time. Every unit goes up on the wall with its diagonal facing the same way, all forty of them, so the piece reads as one continuous surface rather than a set of separate blocks. From there the question stops being technical. Grouping the darker fabrics together builds stripes that travel across the runner and give the eye a path to follow, where scattering them evenly gives an even texture and nothing to look at. Move a few, step back, go and do something else, come back and look again. The author of this one walked away and returned several times before she fixed the arrangement, which is the correct amount of walking away.
Here is the sequence, from the table to the wall:
- Photograph the whole set and convert the picture to black and white. Lay all forty squares out, take the picture from directly above in even light, and turn it greyscale on your phone. What you are looking at then is value alone, which is the property that actually decides whether a diagonal will show.
- Split into lights and darks, then count both piles. Twenty and twenty, because every pair needs one of each. Counting is what turns a vague impression that you have enough contrast into a fact you can rely on before anything is cut.
- Settle the fence sitters by what they will sit beside. A medium is not light or dark on its own, it becomes one or the other next to its partner. Put it in whichever pile needs filling and let the pairing decide its role.
- Mark the diagonal with a ruler that has a forty five degree line. Corner to corner on the back of the lighter square, one clean line, drawn with the ruler's diagonal confirming the angle rather than trusting the corners alone.
- Stitch just inside the line, deliberately scant, on both sides. The width of the pencil mark is real. Give it away twice and the units come back undersized, with nothing left to trim. Sewing a thread's width inside the line on each pass is what leaves you something to work with.
- Shorten the stitch to about 1.8. The unit is going to be cut down the middle and trimmed on bias edges, and a shorter stitch keeps the seam intact through all that handling.
- Press the unit closed, then open it towards the dark. Closed first to settle the ripple along the seam, then open to the darker side. Doing it in the other order presses the wave in permanently.
- Put every unit up the same way round before you judge anything. All the diagonals facing one direction, the whole runner on the wall at once, and then arrange for stripes rather than for even spread. Step back more than once, and give yourself permission to keep moving pieces until it settles.
Seeing the greyscale photograph next to the actual squares makes the point immediately, and the difference between the two views is larger than you expect:
Forty squares, one runner, and no difficult decision after the first one. Everything that follows the sorting is a matter of doing carefully what you already worked out at the table, which is a particularly satisfying way to spend an afternoon. The thinking happens once, in good light, with a photograph to argue with instead of a half sewn top. What you carry away from it is not the runner. It is that you can now look at any pile of fabric and see what it is going to do before you commit a single seam to it, and that is a way of seeing that stays with you.
The whole top comes out of one pack of five inch squares, which is what makes this such a companionable thing to sit down with. Our charm packs come precut at exactly that size with the range of prints already in the pack, so the sorting has something to work with from the moment you open it. If you would like more on choosing by value before anything is cut, our notes on giving every fabric a role take the same idea into blocks with more layers.
