in tibet the melong mirror is a part of shamanic practice in bon po as well as an important part of the dzogchen practice in tibet...
mirrors are also a large part of shamanic practice through out central asia...
excellent for protection as well...
The mirror is an ancient symbol throughout Indian religions. In Indian iconography it may be understood as a symbol for clarity, wholesome or complete perception and 'primordial purity' (Tibetan: ka dag) of the mindstream or consciousness. The mirror is often depicted as an accoutrement[1] of the hagiographical signification of fully realised Mahasiddha, Dzogchenpa and Mahamudra sadhaka. The mirror may be understood as a quality of the mindstream that denotes perceiving experience as it is without obscuration forded by klesha, etc.
The mirror may be engaged in the advanced Tantric sadhana of the Gyulu. As the mirror, so the mind. The mirror as the mind, following Yogacara, reflects quality and form, though is not directly altered and is 'beyond all attributes and form' (Sanskrit: nirguna).
Sawyer (1998: unpaginated) in an essay to accompany curatorial notes for an exhibition and a particular c.19th century xylograph on silk entitled 'Offerings to Mahakala' depicting an 'array of ritual offerings'[2] to the Dharmapala Mahakala, conveys the importance of 'mirror' iconography to Dharmakaya:
The looking glass/mirror (T. me-long, Skt. adarsa), which represents the dharmakaya or Truth Body, having the aspects of purity (a mirror is clear of pollution) and wisdom (a mirror reflects all phenomena without distinction). [3]
en.wikipedia.org
when you can start to see that much of what one sees in visions while on DMT as reflections of ones own mind one can begin to see with clarity...