Shapes become thicker the farther they are from the top-left and bottom-right corners of bounding box vs. some other pattern in shape thickness based on position.

Shapes become smaller the closer they are to the top-left and bottom-right corners of bounding box vs. not so.

Shapes become smaller the closer they are to the top-left and bottom-right corners vs. not so.

https://studentweb.cs.wwu.edu/~tuora/aarontuor/computerscience/bongardproblems.html

Aaron Tuor