[hosepipe]

[ The number and types of dimensions (spatial, temporal) are both unknown and unknowable. ]

True.. Now.. but may not be true in the future.. for some..
Or possibly partially knowable.. There could be dimensions(realms) "we" will never know..
Micro and Macro Universes are even possible..

The possibilies (of what can/could be) are endless..

[Alamo-Girl]

Truly there are many possibilities and to what extent the spiritual man will eventually "know" them is uncertain.