Another way to approach this quilt (for those who don't own the specialty triangle for *on point* setting triangles to cut .. or as dollycaswell's suggestion elaborated carefully and accurately cutting perfect 45 degree angles on a strip set) is to think of this as an hourglass block that has been cut and then those 4 pieces flipped so that the outside edge is turned so it’s now in the center.
With this in mind, I would make a square within a square block... Main color as both the square and the outer strip with a white strip in the middle... then I would cut this block unit like I would any hourglass... cut corner to corner in a diagonal. Once cut I would flip the pieces so that the longer (originally outside edge) was in the center and you would get the same pieced white edged triangles centered on the outside of all 4 sides. For a beginner or more novice quilter this would be an easier way to approach this block. It also makes it more portable for those who can only quilt in smaller snatches of time - like working mothers or weekend quilters.
For a 9” finished square I’d cut a 6” inner square and border it with 2-1/2” strips in white and a 2-1/2” strip of whatever fabric I used in the square.
Like with any hourglass, you would need to make your original block (square within a square within a square) 1-1/4 to 1-1/2 inches larger than you want the finished block to be. The important thing about this way of making this pattern block is that you need to be sure to size each block (using a 12” square ruler) so they are all the same size before cutting – Using your smallest finished box block and size them all to the same size before making the diagonal hourglass cuts.
Some of the white strips using this method would have a seam, but that shouldn't be a problem and would be almost invisible.
Since you don't need to cut the hourglass units out of the sewn blocks until you want to, then you could safely set these aside and you wouldn't take the chance of stretching the bias edge as you were working on getting enough blocks completed to actually assemble the quilt... Also, you could still put them up on a design wall to mix & match the colors or prints... making a block or two at a time, as time permits.
I've used this method to do half triangle or hourglass units out of box within a box or log cabin type units, and using this method makes this very fat quarter or large stash scrap piece friendly- the only real yardage you will need to buy is the white.
Tinabug, to elaborate on what Karenotto said. You'll need 3 strips of fabric: 2 strips of 2-1/2 inch X WOF (width of fabric) colored fabric and 1 strip of white (same size) and sew them all together lengthwise. You'll have approx a 6-1/2 X 40 or 42 +- piece of fabric. It will be colored on the outside edges and white in the center. AFTER carefully pressing, cut this strip on a 45 degree angle back and forth, resulting in several triangles, approx 5-6 as I recall. Sew them together as pictured to make a square and then sew your squares together. Should work! My further suggestion is to try it with some scraps and give yourself permission to make a mistake. Easier to make a mess with scrap fabric and fix it, than expensive stuff.
I would love to make this one too! No idea on how to set this one up.
If you find out what it is, please share. I'd love to make one!
At first I thought it was a variation of Anita Grossman Solomon's Xcentric block, but it's not quite that. Instead, I see half-square triangles mad out of homemade striped fabrics. Do you see that? I see a strip of color-white-color, which is then cut into triangles.