I think DMT lets us experience our own consciousness outside of the local plane our bodies live in. outside of the local plane, anything is possible and our subconsciousness can manifest anything.

"What's in the force cave master yoda?" "Only what you take with you"

What I find interesting is how no two people can ever see precisely the same thing in the same way. Similarly, one can never see himself how other's see him.

DMT, among other psychedelics make this not only possible, but through sensory deprivation it can be achieved on a multitude of levels.

Your answer is far too vague, Schizophrenics contact immaterial beings everyday. Dreaming allows this as well.

in my opinion, most of what we know about science tells us we don't know shit about consciousness/reality and that at this point anything is possible.