Disappearing HST 4 Patch Tutorial

This tutorial explains how to create a Disappearing Half Square Triangle Four Patch quilt block, a simple yet visually striking design that starts with four half square triangles arranged in a specific layout. After assembling the initial block, precise cuts are made 1.5 inches from the center in both directions, then the pieces are rotated to form a new pattern. The block is reassembled in rows, resulting in a dynamic design that looks complex but is easy to achieve, making it ideal for experimenting with color combinations and suitable for quilters of all skill levels. 

This quilt block is another fun variation in the world of disappearing blocks, known as the Disappearing Half-Square Triangle Four Patch. As the name suggests, it begins with half-square triangles instead of plain fabric squares, which gives it a more dynamic look right from the start. Like other disappearing blocks, it is simple to make but creates a design that looks much more complex than it really is.

To begin, create four half-square triangles and arrange them into a four-patch. The layout is important. Two of the triangles should point inward, while the other two should have the darker fabric pointing outward. This arrangement sets up the final design, so take a moment to ensure everything is positioned correctly before moving on.

Once your four patch is assembled, it is time to make the cuts that transform it into a disappearing block. Start by finding the center of your block. From that center point, measure one and a half inches to each side and make a vertical cut. Then rotate the block and repeat the process, cutting one and a half inches away from the center in the opposite direction. A rotating cutting mat is extremely helpful for this step, as it allows you to turn the block without shifting the fabric.

To align your block properly on the cutting mat, use the center seams as a guide. Line them up with the midpoint of your mat to ensure your cuts are as accurate as possible. Even if it is not perfectly centered, getting close will still produce great results.

After making all four cuts, carefully keep the pieces in place so the layout does not shift. Now comes the fun part. Rotate each of the four corner pieces outward. Then rotate the side pieces outward as well. This rearrangement creates the new design that gives the block its signature look.

To assemble the block, treat it as three rows. Sew the pieces in each row together, then join the rows to complete the block. The process is straightforward, but the result is visually interesting and full of movement.

This is a great block for experimenting with different color combinations. Because it is easy to construct, you can focus on playing with fabrics and layouts to achieve different effects. It is a perfect project for beginners who want to try something new or for experienced quilters looking for a quick and satisfying block.

Give this Disappearing Half Square Triangle Four Patch a try and see how creative you can get with it. Follow us on Facebook, subscribe to our YouTube channel, and as always, happy sewing.