Speaker Imaging - Do you hear a line, or do you hear an arc??

Hi Everyone,

I am not trolling, I genuinely am interested in your experiences.


When listening to a system you feel images well, how do you perceive the sound stage? Do you perceive it as a rectangular space on which the speakers sit, or does it sound like an arc, going further back towards the middle?


Please give examples with music and speakers if you have the time.


Thanks,
Erik