I shortened a dress by ripping four inches off the bottom which means threads will separate from the edge until a length for a stable fray is achieved. This varies from fabric to fabric and the design of the garment and the amount and type of wear: a scarf differs hugely from a skirt, for instance. It is interesting to observe.
Yesterday I was sitting on a patio in the sun and unwound the latest dropee from the buckle of my shoe, let it drift down onto the pavement and watched it take on this shape.
A horse head came to mind and then a skull and then Georgia O'Keefe.
Sometimes letters will form, particularly if the thread is being trailed behind me before I stop and it 'catches up', but this was definitely an image.
The wind was testing the edges as I was leaving; I imagine the thread was soon on its way.