HI.
Quote:
Yes, they DO look 3d on their own. But how to draw the ellipses the right size (proportions) and where to place them?? I don't know how to do that without having some structure....or implied structure with guides or grid, or something. Someone with advanced math skills can probably calculate the proper sizes. But most people, including me, would not have that ability.
Brynn, my fault. I should have explained a little better why I recon they look "3d on their own".
As I saw the image I figured the ellipses were actually parts of circular rings seen from front and above.
I saw them sitting on the same plane.
The rings are (parts of) true circles, when seen from an angle they "turn into" (part of) ellipses.
All rings of same color are at the same level (Y-level in "normal" 3d lingo").
Note that the "half-circles in "the back" is "off center" as in OP's original image.
Seen from the top:

(Click Image for larger version.)
When viewed from front:

(Click Image for larger version.)
The images are rendered in POVRAY, the only difference between the two images is the location of the "camera".
(In the Original Poster's image the camera is even lower to the ground level as seen in next image.)
Hope this helps the perception.
( Having said that I might be incorrect in my assumption above,
I have been wrong before and it might even happen again!)
Image with added "focal blur" and lowered camera.

(Click Image for larger version.)
RGDS
Ragnar