Arcana Coelestia # 9608
9608. 'Fifty loops you shall make in the one curtain' means a complete joining together in the outermost parts of the spheres. This is clear from the meaning of 'fifty' as what is complete, dealt with in 2252; from the meaning of 'loops' as a joining together, as just above in 9605; and from the meaning of 'the edge of the curtain', where the loops go, as the place where the sphere of truth ends, also dealt with above, in 9606, that is, in the outermost parts.
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.