I used to "daydream" a lot. When I would "daydream" I would no longerr see or hear or smell, but I would follow these strange patterns in my mind, always going deeper and seeking and end but never finding one. After about 20-30 minutes, I would always reach a strange point where my mind could not go any further, but I knew there was something beyond the point I had reached.
There were no clear directions, it was a very strange experience. I can't attribute it to a dimension and I did 2 years of University Math. I wish I knew what it was.
They became less frequent as I grew older and I had my last experience at 16. Nowadays, I feel like it has translated in me viewing the infinite of the patterns in this world. It's kind of more than that though, and still I cannot explain it. It makes me not want to speak because everything I say, even in this explanation, is incorrect because these words I'm using do not accurately express the thought, emotion, and experience involved at all.