The So-Called Zollner Illusion
All the long diagonal lines are actually parallel to one another. Measure them if you don’t believe me. The short horizontal and vertical lines just make it look otherwise.
Optical Illusion
All the long diagonal lines are actually parallel to one another. Measure them if you don’t believe me. The short horizontal and vertical lines just make it look otherwise.
Tarnmoor 
i wonder what the world really looks like… how do engineers design things when their perception is a bit wonky…?
Good question.