Two years later, reading the chapter The Helmholts Principle again, I am astonished by this statement again.
"We immediately perceive whatever could not happen by chance"
It gives us a simple, so simple, criteria to check whether a visual event is meaningful. If some event does not happen by chance, it is meaningful.
There exists a whole system developed to measure meaningfulness in this sense, aka \[ \delta \] meaningful.
It then relates to several bounding theories from Theoretical Computer Science smoothly.
I found F. Cao is doing very interesting work under this trend: