On the same topics, this is Aaron David Fairbanks Bongard problem n.42. Try to write your solution (with a spoiler if you want). I'll give my solution under a spoiler in few hours.

For more info about Bongard problems in general take a look at my first messages:
https://mathstodon.xyz/@leonardom/116110015131667314
https://mathstodon.xyz/@leonardom/116110093951382315

#bongardproblem #mathpuzzle #puzzle #visualmath