Nachmanides disagrees with Rashi, pointing out that the Biblical spelling of the word "tzitzit" (ציצת) has the gematria of 590 rather than 600, which upends Rashi's proposed gematria. He points out that in the Biblical quote "you shall see "it" and remember them", the singular form "it" can refer only to the thread of "tekhelet". The "tekhelet" strand serves this purpose, explains the Talmud, for the blue color of "tekhelet" resembles the ocean, which in turn resembles the sky, which in turn is said to resemble God's holy throne – thus reminding all of the divine mission to fulfill His commandments. (Nachmanides knots are worn by the majority of Sephardic Jews and Teimani Jews)