I’m not really sure whether it’s anything special. But for me, it’s a way to sew or quilt with fabric strips even with little experience.
I like the results, and sewing the straight lines helps me relax.
You start in the middle. I sewed 3 fabric strips together and then sewed them onto the fabric (quilted). You sew from the inside outward. First right, then left, then top, then bottom.
The topstitching quilts the fabric onto the batting. And that way, the sewing lines run crosswise once, then vertically again.

The size is set before you start sewing. Normally you use thick batting. Unfortunately, my fabric shop didn’t have any left in stock, so I cut up an old fleece blanket that was no longer wanted.
I’ve written down the order for sewing the fabric strips here.
I’d be happy to send a link where it’s described really well.