Visual Bongard Problems where switching black and white in any sorted example renders the example unsortable vs. visual Bongard Problems where some example can have its colours inverted and remain sorted.
Visual Bongard Problems where switching black and white in any sorted example renders the example unsortable vs. visual Bongard Problems where some example can have its colours flipped and remain sorted.
COMMENTS
Most visual BPs will be sorted left by this problem, as examples usually have white backgrounds by default.