Tzitzit on my Sephirot Tallit.
Decorating the tallit is for Hiddur Mitzvah / beautification enhancement of ritual, ceremonial objects.
Tohar is related to tsohar, which means: transparent; something whose particles are homogeneous and allow rays of light to pass through them. A pure object – the tahor – is receptive, and the Divine light penetrates it. A pure person is one who is receptive to the spiritual, to the Divine; one whose mind, heart, and body are suffused with the Divine light. (Commentary to Genesis 7:2)
* Blue snail ink from the Murex Trunculus 'Hilazon'.
(Copy of letter accompanying submission to Josh Fleet, Huff Post Religion Editor for Omer Blog)