Incredible work, I strive to do hard-surface modeling as good as this someday <3

@mimi Thank you !
@gnom I quickly modeled low poly stuff and a few sphere with emissive material, put them in the background in a cube with a volumetric shader (cut the surface node, add a volume scatter .01 density). The shallow depth of field made on the camera is what blurs everything in the back. I'm going to make some short tips video on youtube soon, it might be more clear ! I'll notice it on my instagram !

Dude, how did you make that background ?

love your work