here is a symbolic representation of the chakras,
or "psychic centres that lie along the axis of the spine as consciousness potentials" (tantra-kundalini/chakras).
to explore more about chakras, yoga, samadhi
meditation and spirituality, you might want visit tantra-kundalini.com, life bliss.org, read this
article about kundalini yoga, explore the
teachings of sri ramana maharishi,
or visit kriyayoga-yogisatyam.org
...Just find a place that
resonates with you; where you feel best both developing your unique
Divine expression or personality + gaining enlightenment
(thereby contributing to the evolution of all).