Two true circles drawn over the rings, with the same center.
Straight, bent or tilted?
Two circles
Do the two rings have the same center?
Yes: they are two perfect circles with the same center, though they seem to drift apart on one side and nearly touch on the other.
Why? The blobs make each ring’s edge seem to lean, like a twisted cord, one way on one side and the other way on the other, and the two rings lean in opposite directions. Your brain shifts each circle to follow its lean. After Akiyoshi Kitaoka; this is our drawing.
Picture: Drawn by Science Playground, after Akiyoshi Kitaoka · Wikipedia(opens in a new tab)