In my experience the best speakers at disappearing tend to be planar - the original Quads were quite good and ones that I still own, primarily because of this particular attribute, are Martin Logan CLS.
Speakers that disappear
I once listened to some speakers where i was surprised by their disappearing act - I don't remember the brand - I think they were stand mounted. I am currently looking for speakers - not too big - and was hoping for recommendations - I know other components matter too but I understand some speakers are noted for this trait and some don't. I listen mostly to classical and vocals, lighter pop - no hard rock (I assume the Beatles and 60's count as "light" :) ) Speakers I have
Harbeth PS3ER XD,
Martin Logan Stylos Speakers (wall mounted)
Aurum Cantus Leisure 2 Speakers,
Enigma Speakers - Enigma Oremus
Had Focal Aria 906
Thanks!