Demo (3/3): Solidity shapes the perception of object motion

Explanation
Here, the preference for the 180° interpretation is reduced (for many, the unstable percept is restored).
This is likely due to the fact that object solidity can no longer be violated thanks to the gaps.

This also suggests that the proximity of the rings cannot explain the effect. The visual system indeed incorporates solidity to guide interpretations of ambiguous motions.

Separated Overlapping Gapped