Instead of calling it a 3D effect
You could say Foveon images have a "you can walk into the picture" effect. That's what I see when viewing some pictures taken with my DP1s.
This print struck me that way too
The effect seems not quite so noticeable online; that's why experiencing prints can be different than online viewing.
|Nectar Dancing by Lensmate|
from A Big Year - birds
|Sad clown by PEB|
|Mtl Gen X 2015 DP by MarioSS|
from - Gen X - (In Full Colours+ Border)