The second type of Samadhi described by Patanjali in his Yoga Sutra 1.17 is 'Savichara Samadhi'
The State of Samadhi attained here is the result of concentrating on Subtle Objects, like the Gods,or the chanting of Pranava OM, where the thoughts in the first case encourages mental picture, while in the later they are produced by the vibrations of the Pranava,
Couple of points.
In Buddhism by the Tibetan Monks, Lamas,, the body is explained have three layers,
The Gross Body, which we see,
The Etheric Body, which extends up to one eights of an inch surrounding the Gross body,
The Auric Body,which surrounds the Etheric Body for another one eighth of an inch and,
Aura, which surrounds the whole.
In Indian Philosophy this phenomenon is explained while describing the Five sheaths of the Atman or Reality, the Five sheaths being,
Annamaya Kosa (of Food),
Pranamaya Kosa,(of Vital Breaths)
Manomaya Kosa,(of Mind)
Vigyanamaya Kosa (of Knowledge)
Anandamaya Kosa.(of Bilss)
It is also interesting to note Japas, the practice of chanting a sacred name or Hymn is three-fold.
1.Chanting aloud, the first Stage,
2.Chanting but not aloud; the lips alone should move.
The Mantras give fruits , right from the first stage,
