The illusion of the above looks like the viewer feels like falling into the hole that is enlarged. And there was a sufficient explanation of why this happened.
Visual tricks can be caused by different elements of visual systems and nerve systems, even if the effect is similar. For example, a circle that rotates the brell stuff illusion is created by communication delays between different areas of the brain that treats visuals. Meanwhile, another rotating circle illusion …
Source: www.newscientist.com