@Anis 
It's very depending of the sort of univers you want! ;) 
For the last 2 previous images it was different than usual! 
I import a big image very defined (hopefully now in one time) and project on any volumes (here just half sphere) 
For the moment a very tiedious work because i must project each "matrix" so not my cup of tea! :) 
Here maybe 10 minutes for the part that you see! So not my normal way!
  
 
Normally i modelize any thing in less one minute then render!
 
It's the render + parameters who gives the final result! ;)
 
Normally that is like in less 1-2 minutes! (depending od the moment of inspiration! ;)
  
and a render somewhere in the cubic volume with a stereoscopic Projection so an infinite world of possibilities! :) 
Try it it's very gratifiant!
   
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