In Exodus 26:4, this signifies a joining together by means of the celestial love of truth. (Arcana Coelestia 9605)

9605. 'And you shall make loops of violet' means a joining together by means of the celestial love of truth. This is clear from the meaning of 'loops' as a joining together, the reason why this is meant by 'loops' being that they serve to join things together; and from the meaning of 'violet' as the celestial love of truth, dealt with in 9466.