Cross section of a cube vs. not cross section of a cube
All examples in this Problem are solid black shapes.
This problem is absurdly hard. It makes a good extreme example. - Aaron David Fairbanks, Nov 23 2020
This problem is absurdly hard. - Aaron David Fairbanks, Nov 23 2020
This problem is absurdly difficult. - Aaron David Fairbanks, Nov 23 2020
Valid cross sections of a cube vs. invalid cross sections of a cube
Leo Crabbe
Valid cross section of a cube vs. not cross section of a cube
Valid cross sections of a cube vs. not cross sections of a cube