Lisa Thomas about this 5 strand paracord braid:

“Ruby's Rainbow is actually not a new knot; it is a normal five-plait braid, only with a guide.
I had the idea to make the braid suitable for collars when I was still doing a lot of knotting myself, especially for our dog. A popular online shop for dog fashion offered a similar design at the time, and many people in the paracord community puzzled in vain for a long time about how this knot worked.
As part of a community, I found and still find it important not only to benefit from the skill sharing of others, but also to contribute myself. And when, quite by chance, the penny dropped over a cup of tea and Ruby's Rainbow was born, it was only natural for me to share the knot with the community.”