Each of us has an inner child or a true self. This inner child is molded according to our childhood experiences. Happy childhoods produce an inner child who is contented and at peace while abusive childhoods create a lost and wounded one.
Gurdjieff has prepared a group of dancers. The dancers created such a meditative energy, such a great wave of energy, that those who had come just to see the dance, suddenly forgot the dance completely. Something else was there by the side, a door opened through it.. (commentaries by osho)
To develop your clairvoyance, you must be able to attain a higher level of consciousness. You need to work on your spirituality and this can be done in several ways. The most common way is through tapping the power of your third eye. Another effective way is through constant meditation.