symbol of light and color in'ala- al dawla semnani and sayyid muhammad nūrbakhsh thoughts

in islamic sufism and mysticism, especially the sufi order kubrawiyya, descripting the waystation of traversing and aspect of heart and vision of privacy by lights and colors and the sufi master role in this regard has special significance. 'ala- al dawla semnani(659-736) and sayyid muhammad nūrbakhsh (795-869), two renowned mystics of this order, in their works have addressed this issue. 'ala- al dawla what say kubrawiyya, seven aspect of heart, calls it subtle things and in his exposition, each of these seven subtle things in human existence that is microcosm, as existence of the prophet and  their manifestation  in macrocosm and also one of these, possessing specific light with color specialty its own that wayfarer in stages and aspects, in revealing will see the light. nūrbakhsh too by explanation stages of  light and divide it into existence, knowledge, and brightness(d‎‎‎iya′) and accordance of each with fifth worlds and imagination of it with colors and  expression of  divine emanation and its relationship with the celestial spheres, and the symbolic relationship between erratic lights and determining manifestations has given symbolic form to this issue.  analytical and comparative study of the subject in some kubrawiyya mystical texts and works of semnani and nūrbakhsh, can open up new territory for man to understand the mystical unveiling.