Existential prayer is one form of mystical contemplation. It is the prayer of just being. It has few words; and perhaps it has no images at all. In this prayer I just AM -- like the flower of the field or the birds of the air; and by just being I give glory to God.
To open to the sense, to become really conscious, you have to drop out of the future and the past and remain for a time in what T. S. Eliot called "the still point of the turning world" — the present. The only true reality is the present.