In the Vedantic and Tantric view, the Manas") is the inner instrument that receives sensory impressions, holds them, and reflects upon them.
Chid Ākāśa (also called Chittākāśa) is not physical space. It is the subtle, infinite field of awareness in which all mental images and perceptions appear.
When you close your eyes after gazing at a Yantra, you first encounter blackness.
Tantric practice divides Yantra contemplation into two essential stages:
Learn the step-by-step process of transitioning from external Yantra gazing to inner absorption in Chid Ākāśa—the luminous space of pure consciousness behind closed eyes.