I seen a video on how to make a square in a square by folding the fabric and then sewing it, I can't seem to find this tutorial video, does anyone know where it is or who made the tutorial..

I do remember the lady took a 10 inch sq and a smaller one and put the small one on top of the big one and folded it some how and and then sewed but can't remember anything else on how to do this.. she also made other blocks this way ... if anyone could help me find this video that would be great,, Thanks