As I was walking in my city, observing plastics and people, I made interesting discoveries.
As shown in the pictures, it only needs a specific form to induce behavior. The light protective grid has holes the size of a cigaret and suggests that this is especially made for cigarets disposal. For the stone natural hole, it's the same principle, the only thing is we obviously know it's not made on purpose for cigaret disposal, but people still use it!
And then, it only needs 3 "exemplary" behaviors for everyone to follow!