start at about 1:35

Animation:

Closeups of sewing machine needles:

Closeups of straight stitches on fabric — blue is top thread, red is bobbin:

“A sewing machine moves a needle though cloth or paper.

Without thread, it punches holes (have sample of paper with needle punched holes - make a design they easily recognize, such as a star).

With thread, it hold two pieces of cloth or paper together (have sample).”