NOCODUSA on Instagram: "This is how stitches are formed on a classic sewing machine: A traditional lockstitch sewing machine creates each stitch using two threads working in perfect synchronization. The upper thread comes from the needle, while the lower thread is supplied by a bobbin hidden beneath the needle plate. As the machine runs, the needle rapidly moves up and down, piercing the fabric with the upper thread. When the needle reaches its lowest point, a precise hook mechanism called the s