I remember one experience years past where I was convinced I was sensing another person, entity, desperately trying to communicate, singing snatches of words, turning the hyperspace dimensional fields of force, trying to reach out to touch this infinitely exciting new, unknown other.
After a long struggle, at the peak of the experience I finally turned the corner, found the right hole in the space-time grid I was sliding through, found the correct meshing of body part to environment to produce communication... to discover that this other entity was in fact, myself. Like an animal confused by its reflection in a mirror, I had been chasing my own tail the whole time.