This knot design is after Albert Durer. He labeled it as for craftperson's use. This may be a craft he didn't anticipate, but I figure it qualifies. This is obviously an adaptation of Da Vinci's design. It is simpler but more elegant. I have added the traditional celtic knot design in the center. I have designed this with a t shirt in mind, but it can also be done as a print, poster or card. I am not posting it, but this can be done as an inverted version of black on white as with the Da Vinci mandala.