And here is a completed knot:
I will tell you a little secret--I use a sharp needle when I do satin stitch on samplers and pierce the ground fabric if I need to to get a smooth look. I've had teachers tell me that I shouldn't do that for conservation purposes since it could weaken the fabric.
To them I say, "Nay, nay."
I do not believe that 17th century embroiderers thought about conservation and long-term survival. I think they thought about how the finished embroidery would look. I think they put the stitches where they looked best. And if it takes a sharp needle to do that, I will use a sharp needle.
Notice I did not say that this was a safe pursuit. I have left my DNA in a number of projects in which the sharp needle pierced not only the thread but my tender and delicate personage as well. However, I do like the way my satin stitches look.
And on a totally different topic, today is my Little Sister's birthday. Granted, she's been much taller than I for years, but she will always be my Little Sister. And I love her. So, Happy Birthday to you!