Speakers that excel at depth/layering/space

I second Johnsonwu's observation re: a widebander, for it's coherence. It doesn't have to be just a widebander-it can be augmented with a supertweeter and a sub (built in or not). So many variables here.
The best and really, only time I heard jaw dropping, 3-D sound with that layering you allude to was with some entry level Unity Audio speakers a couple of decades ago. Most of it was due to some very high quality tube equipment and room placement/design. I've never heard it that good again. Ever.

mbl if you have a suitable room.

dynaudio contour 1.3mkii in smaller rooms.

also ohm walsh properly matched to room.

as you can tell, integration of speaker into room is key to get good imaging depth imho.

Sounds like someones been smoking those left handed cigarettes .

Vandersteen.

"Width and openness is one thing, but depth with layering and space from front to back is much rarer."

It's not rare at all with electrostatic speakers.