Joining Squares Idea in Crochet, Zigzag Slip Stitch Method, Embroidery Inspired

How to join a crocheted granny squares in zigzag slip stitch method. This join is tight, flat has a nice neat seam in both sides even when stretch, very easy and it works fast. Time lapse: How to join in the middle. First middle line at 4:01 and 7:33 the final join in the middle. If the video is too fast or slow: click the video settings or the 3 dots set to your desired playback speed.