Astral projection is a Gnostic holiday. Try to remain in the body at all times, especially during meditation. Meditation time is the only time when the 3 wise monkeys do not cripple. Avoid all talking and singing entities on your "accidental" journeys - especially anthropomorphic animals and gods.
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https://en.m.wikipedia.org/wiki/Set_theory
https://en.m.wikipedia.org/wiki/Set_theory_(music)
It was during these attempts that my first set of tactile hallucinations attacked.
"The sacrum (/ˈsækrəm/ or /ˈseɪkrəm/; plural: sacra or sacrums;[1] Latin os sacrum[2]) in human anatomy is a large, triangular bone at the base of the spine, that forms by the fusing (setting?) of sacral vertebrae S1–S5 (another set?)"
http://www.thefreedictionary.com/set
"inverted arrow shape"
Above the so called last remnants of our 'tails'....(the coccyx...which is yet another set)