It echoes in my mind that space time is not fundamental. I thought I read this in some psychics experiments, saw it in YouTube videos and/or read it in a book related to Buddhism. But I far from recall the details. I searched for space time not being fundamental on the topic of Buddhism but I am not really finding much about it.
With space time not being fundamental I mean to say that it is a construct of the mind. One can understand it is a mental construct, but still experience space time.
I am asking about the Buddhist view on space time, and the implications of that view.
I am asking because of the following experience I had. Recently I experienced some different perception during meditation. It was like my perception of the room I was sitting in vanished and there was no perception anymore of me having a body, sitting in a room. But I would not say I changed, I was still present. And I had my eyes closed all along. This experience of no longer having a body happened to me a couple of times during meditation now.
More recent I was doing a mental exercise to get the difference more clear about experience coming from sensory perception, and experience coming from the mind. I did so by focusing on my body, and then on some memory of how something felt tactically, and then switch focus back on my body, and so forth. I was switching like this continuously. Every time that I switched I mentally called out the difference (using my inner voice, so not out loud):
Experience from sensory perception
Experience from mental perception
At some point the distinction became more clear. At that moment it was clear to me the experience of space time arises because of a mental process. At that moment I could solely focus on sensory perception, and the awareness of space time was gone. And I could go back as well to experience space time again. I then experienced having a body again, sitting in the car, on a parking lot in front of the office. And I could go back again, focusing solely on sensory perception, where there was no experience anymore of me having a body. It was like space contracted to be dimensionless and I had no awareness of my body anymore, nor the car I was sitting in. Or maybe I should say that there was nothing more but the experience of the body. The bodily awareness was different. All encompassing vs being part of something else. I am having difficulties to describe my experience. I could still think of my body and the car though, but the experience of having a body and sitting in a car stayed away. It stayed away for as long as I kept this focus on sensory perception. It was like I was withholding my mind from creating the spatial awareness or something.
I'm so curious to explore this more. Also how it relates to the self-awareness and experience of space time in dreaming (so a lucid dream). And I am really curious if there is some perspective from Buddhism on this kind of experience.