Double Pyramid is the name Jan Halgrimson gives to this wonderfully scrappy block (Great Scrapbag Quilts, p28). Building real pyramids from tiny half square triangles would be impossible, but it’s a really handsome block and a great way to make a dent in your scraps.
To make one 12inch block you need: 3 squares 4 1/2inches, 3 squares 4 7/8inches cut once on the diagonal to yield 6 half square triangles, 36 half square triangle units (72 triangles), 24 half square triangles. For triangles cut 1 7/8inch squares and cut once on the diagonal. Or cut 2inch squares, cut once on diagonal and trim if necessary once stitched.
We’re not going to do the math to work out how many pieces would be needed for a 4x4block quilt (48inches square without sashing or borders) – we know it’s a LOT! but here’s a couple of virtual quilts to show you the effect –
So we’re off to cut scraps into strips, strips into squares and pair squares to make half square triangle units – we may be some time!